Avoid multiply-defined symbols that lead to link errors such as:

  gcc -O2 -fno-strict-aliasing -fwrapv -Wall -fno-tree-vrp  -g -D_FILE_OFFSET_BITS=64 -D_REENTRANT -DCAML_NAME_SPACE  -Wl,-E -o ocamlruni prims.o libcamlruni.a -lm  -ldl -lpthread 
  ld: libcamlruni.a(backtrace.i.o):/tmp/guix-build-ocaml-4.07.1.drv-0/ocaml-4.07.1/byterun/backtrace.c:31: multiple definition of `caml_debug_info'; libcamlruni.a(backtrace_prim.i.o):/tmp/guix-build-ocaml-4.07.1.drv-0/ocaml-4.07.1/byterun/backtrace_prim.c:47: first defined here

diff --git a/asmrun/startup.c b/asmrun/startup.c
index 070f0c6..cf8a56f 100644
--- a/asmrun/startup.c
+++ b/asmrun/startup.c
@@ -44,7 +44,6 @@
 #endif
 
 extern int caml_parser_trace;
-CAMLexport header_t caml_atom_table[256];
 char * caml_code_area_start, * caml_code_area_end;
 struct ext_table caml_code_fragments_table;
 
diff --git a/byterun/backtrace.c b/byterun/backtrace.c
index 8dfe9b7..9cc9e72 100644
--- a/byterun/backtrace.c
+++ b/byterun/backtrace.c
@@ -28,7 +28,7 @@
 #include "caml/fail.h"
 
 /* The table of debug information fragments */
-struct ext_table caml_debug_info;
+static struct ext_table caml_debug_info;
 
 CAMLexport int32_t caml_backtrace_active = 0;
 CAMLexport int32_t caml_backtrace_pos = 0;
diff --git a/byterun/backtrace_prim.c b/byterun/backtrace_prim.c
index e69b256..d794f73 100644
--- a/byterun/backtrace_prim.c
+++ b/byterun/backtrace_prim.c
@@ -44,7 +44,7 @@
 #include "caml/backtrace_prim.h"
 
 /* The table of debug information fragments */
-struct ext_table caml_debug_info;
+static struct ext_table caml_debug_info;
 
 CAMLexport char_os * caml_cds_file = NULL;
 
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<div class='path'>path: <a href='/guix/log/?id=12474d20d24ce2c4a8c220c3e970c24a97a3c9dc'>root</a>/<a href='/guix/log/gnu?id=12474d20d24ce2c4a8c220c3e970c24a97a3c9dc'>gnu</a>/<a href='/guix/log/gnu/packages?id=12474d20d24ce2c4a8c220c3e970c24a97a3c9dc'>packages</a>/<a href='/guix/log/gnu/packages/curl.scm?id=12474d20d24ce2c4a8c220c3e970c24a97a3c9dc'>curl.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/curl.scm?id=12474d20d24ce2c4a8c220c3e970c24a97a3c9dc&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-04-18 10:39:49 -0400'>2024-04-18</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=a69e5e5e47b70e3fe14040142544147fbd9239a1'>gnu: gnurl: Properly deprecate package.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2024-02-13 14:19:05 +0000'>2024-02-13</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=a4aac98bbb6e6475ba7e35ad0eb82d861e483709'>gnu: go-golang-org-x-sys: Move to golang-build.</a><span class='msg-avail'>...</span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2024-01-23 14:01:51 +0000'>2024-01-23</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=fbeae77ae6b8c4ad1c23e65d172b38c5a80bf2e3'>gnu: trurl: Update to 0.9.</a><span class='msg-avail'>...</span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2023-12-25 11:36:20 +0200'>2023-12-25</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=bdab356332e391e09d0feafe0fcac9c52388a07d'>gnu: curl: Fix test suite on arm platforms.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-12-17 01:27:00 -0500'>2023-12-17</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=bc7713fa8878ab8a2158c8660d9b2bbb8fb2f77e'>gnu: curl: Update to 8.5.0 [security fixes].</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2023-11-30 07:12:41 +0100'>2023-11-30</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=e0885fcfbb12942f566a5ce9a4f3199a4d191723'>gnu: curl: Skip failing test on the Hurd.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-11-15 18:02:39 +0200'>2023-11-15</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=bc71be1a1d1491087c2588ad7d3a12974c2f1403'>gnu: curl: Skip failing test on arm machines.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-11-05 22:09:48 -0500'>2023-11-05</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=d70f2b788e56545f93dc24238d2617e20fde7460'>gnu: curl: Run tests in parallel.</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2023-11-05 22:09:47 -0500'>2023-11-05</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=00442f15d46cd9d5d02499827946d23426aad0ba'>gnu: curl: Ungraft.</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2023-10-25 11:59:58 +0200'>2023-10-25</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=a0060934a5d7c0bfe81652b31fded150a0ed8e3d'>gnu: curlie: Update to 1.7.2.</a><span class='msg-avail'>...</span></td><td>Imran Iqbal</td></tr>
<tr><td><span title='2023-10-11 23:12:15 -0400'>2023-10-11</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=f62737bfee086040fa3ecb26968f6d16f84147aa'>gnu: curl/fixed: Fix version.</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2023-10-11 22:08:14 -0400'>2023-10-11</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=d6d706a58b8159748d3a46fa97cae18850487c8a'>gnu: curl/fixed: Update to 8.4.0 [security fixes].</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2023-10-10 18:45:44 +0200'>2023-10-10</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=fc6c910f797ea232f6019c4ca5dbd105f78928df'>gnu: curl/fixed: Skip failing test on the Hurd.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2023-10-05 09:41:31 +0200'>2023-10-05</span></td><td><a href='/guix/commit/gnu/packages/curl.scm?id=759b55712e62e913f5ab650651108649775cead2'>gnu: curl: Update to 8.3.0.</a><span class='msg-avail'>...</span></td><td>Liliana Marie Prikler</td></tr>