By default, 'RTDLLIST' in 'ldd' refers to 'lib64/ld-linux-x86-64.so', whereas
it's in 'lib/' for us.  This patch fixes that.

--- glibc-2.17/sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed	2012-12-25 04:02:13.000000000 +0100
+++ glibc-2.17/sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed	2013-09-15 23:08:03.000000000 +0200
@@ -1,3 +1,3 @@
 /LD_TRACE_LOADED_OBJECTS=1/a\
 add_env="$add_env LD_LIBRARY_VERSION=\\$verify_out"
-s_^\(RTLDLIST=\)\(.*lib\)\(\|64\|x32\)\(/[^/]*\)\(-x86-64\|-x32\)\(\.so\.[0-9.]*\)[ 	]*$_\1"\2\4\6 \264\4-x86-64\6 \2x32\4-x32\6"_
+s_^\(RTLDLIST=\)\(.*lib\)\(\|64\|x32\)\(/[^/]*\)\(-x86-64\|-x32\)\(\.so\.[0-9.]*\)[ 	]*$_\1"\2\4\6 \2\4-x86-64\6 \2x32\4-x32\6"_
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<div class='path'>path: <a href='/guix/log/?id=3840c515552207706aca8128066142d52bf64476'>root</a>/<a href='/guix/log/tests?id=3840c515552207706aca8128066142d52bf64476'>tests</a>/<a href='/guix/log/tests/packages.scm?id=3840c515552207706aca8128066142d52bf64476'>packages.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/tests/packages.scm?id=3840c515552207706aca8128066142d52bf64476&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-17 22:55:01 +0100'>2019-03-17</span></td><td><a href='/guix/commit/tests/packages.scm?id=f258d8862852db9779945658b3a3f2b8a2a4c217'>packages: Add 'package-input-rewriting/spec'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/packages.scm (package-input-rewriting/spec): New procedure.
* tests/packages.scm ("package-input-rewriting/spec")
("package-input-rewriting/spec, partial match"): New tests.
* doc/guix.texi (Defining Packages): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-16 01:00:08 +0100'>2019-02-16</span></td><td><a href='/guix/commit/tests/packages.scm?id=36754eee28187b41e9a6ef15cd3c9911449a4e8d'>packages: Remove duplicates from package cache.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously the same package could appear several times if several
variables were bound to it, as is notably the case for "python"
currently.  This, in turn, would lead to obnoxious "ambiguous package
specification" messages.

* gnu/packages.scm (generate-package-cache)[expand-cache]: Change RESULT
to RESULT+SEEN and adjust accordingly.
Call 'first' on the result of 'fold-module-public-variables*'.
* tests/packages.scm ("fold-available-packages with/without cache"):
Check for lack of duplicates in FROM-CACHE.
</span></span></td><td>Ludovic Courtès</td></tr>