Build vercmp without needing link to libalpm

Include the object file directly from the libalpm version comparison code as
it is the only thing we need. This drops the dependency of vercmp on
libalpm and all of the stuff we know it drags in.

Signed-off-by: Dan McGee <dan@archlinux.org>

src/util/Makefile.am

@@ -16,7 +16,7 @@ INCLUDES = -I$(top_srcdir)/lib/libalpm
 AM_CFLAGS = -pedantic -D_GNU_SOURCE
 
 vercmp_SOURCES = vercmp.c
-vercmp_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la
+vercmp_LDADD = $(top_builddir)/lib/libalpm/version.o
 
 testpkg_SOURCES = testpkg.c
 testpkg_LDADD = $(top_builddir)/lib/libalpm/.libs/libalpm.la

src/util/vercmp.c

@@ -23,12 +23,14 @@
 #include <stdio.h> /* printf */
 #include <string.h> /* strncpy */
 
-#include <alpm.h>
-
 #define BASENAME "vercmp"
 
 #define MAX_LEN 255
 
+/* forward declaration, comes from vercmp.o in libalpm source that is linked in
+ * directly so we don't have any library deps */
+int alpm_pkg_vercmp(const char *a, const char *b);
+
 static void usage()
 {
 	fprintf(stderr, "usage: %s <ver1> <ver2>\n\n", BASENAME);