Regenerate configure in gold

Regenerate configure for zlib.m4 change, which adds --with-system-zlib and
removes --with-zlib in gold.  zlib is enabled unconditionally with builtin
zlib imported from GCC.

	* Makefile.am (ZLIB): New.
	(ZLIBINC): Likewise.
	(AM_CFLAGS): Add $(ZLIBINC).
	(AM_CXXFLAGS): Likewise.
	(ldadd_varldadd_var): Add $(ZLIB).
	(incremental_dump_LDADD): Likewise.
	(dwp_LDADD): Likewise.
	* compressed_output.cc: Don't check HAVE_ZLIB_H to include
	<zlib.h>.
	(zlib_compress): Don't check HAVE_ZLIB_H.
	(zlib_decompress): Likewise.
	* options.h (compress_debug_sections): Likewise.
	* configure.ac (AM_CONDITIONAL): Removed.
	* testsuite/Makefile.am (ZLIB): New.
	(LDADD): Add $(ZLIB).
	Don't check HAVE_ZLIB.
	* Makefile.in: Regenerated.
	* config.in: Likewise.
	* configure: Likewise.
	* testsuite/Makefile.in: Likewise.

gold/compressed_output.cc

@@ -21,11 +21,7 @@
 // MA 02110-1301, USA.
 
 #include "gold.h"
-
-#ifdef HAVE_ZLIB_H
 #include <zlib.h>
-#endif
-
 #include "parameters.h"
 #include "options.h"
 #include "compressed_output.h"
@@ -33,8 +29,6 @@
 namespace gold
 {
 
-#ifdef HAVE_ZLIB_H
-
 // Compress UNCOMPRESSED_DATA of size UNCOMPRESSED_SIZE.  Returns true
 // if it successfully compressed, false if it failed for any reason
 // (including not having zlib support in the library).  If it returns
@@ -124,24 +118,6 @@ zlib_decompress(const unsigned char* compressed_data,
   return true;
 }
 
-#else // !defined(HAVE_ZLIB_H)
-
-static bool
-zlib_compress(const unsigned char*, unsigned long,
-              unsigned char**, unsigned long*)
-{
-  return false;
-}
-
-static bool
-zlib_decompress(const unsigned char*, unsigned long,
-		unsigned char*, unsigned long)
-{
-  return false;
-}
-
-#endif // !defined(HAVE_ZLIB_H)
-
 // Read the compression header of a compressed debug section and return
 // the uncompressed size.