Remove dependencies on bundled zlib, pcre and expat.

diff --git a/Makefile.in b/Makefile.in
index 4360a26..80f9f59 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -210,8 +210,7 @@ coda_matlab_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
 @BUILD_MATLAB_TRUE@@SUBPACKAGE_MODE_FALSE@	-rpath \
 @BUILD_MATLAB_TRUE@@SUBPACKAGE_MODE_FALSE@	$(matlabmexexecdir)
 am__DEPENDENCIES_1 =
-libcoda_la_DEPENDENCIES = @LTLIBOBJS@ libexpat_internal.la \
-	libpcre_internal.la libz_internal.la $(am__DEPENDENCIES_1) \
+libcoda_la_DEPENDENCIES = @LTLIBOBJS@ $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1)
 am__libcoda_la_SOURCES_DIST = libcoda/coda-ascbin-cursor.c \
 	libcoda/coda-ascbin.h libcoda/coda-ascii-cursor.c \
@@ -306,8 +305,7 @@ libcoda_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
 	$(libcoda_la_LDFLAGS) $(LDFLAGS) -o $@
 @SUBPACKAGE_MODE_FALSE@am_libcoda_la_rpath = -rpath $(libdir)
-am__DEPENDENCIES_2 = @LTLIBOBJS@ libexpat_internal.la \
-	libpcre_internal.la libz_internal.la $(am__DEPENDENCIES_1) \
+am__DEPENDENCIES_2 = @LTLIBOBJS@ $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_1)
 libcoda_internal_la_DEPENDENCIES = $(am__DEPENDENCIES_2)
 am__libcoda_internal_la_SOURCES_DIST = libcoda/coda-ascbin-cursor.c \
@@ -898,8 +896,8 @@ INSTALL_DATA_HOOK_TARGETS = $(am__append_1)
 UNINSTALL_HOOK_TARGETS = 
 CLEAN_LOCAL_TARGETS = $(am__append_11)
 ALL_LOCAL_TARGETS = 
-@SUBPACKAGE_MODE_FALSE@noinst_LTLIBRARIES = libcoda_internal.la libexpat_internal.la libpcre_internal.la libz_internal.la
-@SUBPACKAGE_MODE_TRUE@noinst_LTLIBRARIES = libcoda_internal.la libexpat_internal.la libpcre_internal.la libz_internal.la
+@SUBPACKAGE_MODE_FALSE@noinst_LTLIBRARIES = libcoda_internal.la
+@SUBPACKAGE_MODE_TRUE@noinst_LTLIBRARIES = libcoda_internal.la
 
 # libraries (+ related files)
 @SUBPACKAGE_MODE_FALSE@lib_LTLIBRARIES = libcoda.la
@@ -1048,7 +1046,7 @@ libcoda_hdf5_files = \
 
 libcoda_la_CPPFLAGS = -Ilibcoda/expat -I$(srcdir)/libcoda/expat -Ilibcoda/pcre -I$(srcdir)/libcoda/pcre -Ilibcoda/zlib -I$(srcdir)/libcoda/zlib $(AM_CPPFLAGS)
 libcoda_la_LDFLAGS = -no-undefined -version-info $(LIBCODA_CURRENT):$(LIBCODA_REVISION):$(LIBCODA_AGE)
-libcoda_la_LIBADD = @LTLIBOBJS@ libexpat_internal.la libpcre_internal.la libz_internal.la $(HDF4LIBS) $(HDF5LIBS)
+libcoda_la_LIBADD = @LTLIBOBJS@ $(HDF4LIBS) $(HDF5LIBS)
 libcoda_internal_la_SOURCES = libcoda/coda-ascbin-cursor.c \
 	libcoda/coda-ascbin.h libcoda/coda-ascii-cursor.c \
 	libcoda/coda-ascii-internal.h libcoda/coda-ascii.c \
.scm?id=8c8fb5c878b0efc02dc92e31e90d40fc4d850937&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-06 00:14:13 +0200'>2020-04-06</span></td><td><a href='/guix/commit/gnu/system/keyboard.scm?id=2729cb406d9f3e9eb22cc660f887138134edb3a8'>system: Allow for comma-separated keyboard layouts.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-24 23:06:11 +0100'>2019-03-24</span></td><td><a href='/guix/commit/gnu/system/keyboard.scm?id=db1e2522f6222594fc507ce7a7ba7b1c0ac5037d'>Add (gnu system keyboard).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>