libostree: Link with libgpg-error for gpg_strerror_r API

With f461c02 use of gpg_strerror_r
was added this symbol comes from libgpg-error however, therefore its
needed to add -lgpg-error to cmdline to resolve this symbol especially
with gold and lld linker. Fixes

aarch64-yoe-linux-ld.lld: error: undefined reference due to --no-allow-shlib-undefined: gpg_strerror_r
>>> referenced by ./.libs/libostree-1.so

(cherry picked from commit c3bd439)

configure.ac

@@ -214,8 +214,7 @@ AC_ARG_WITH(gpgme,
 	    [], [with_gpgme=yes])
 AS_IF([test x$with_gpgme != xno], [
     have_gpgme=yes
-    PKG_CHECK_MODULES([OT_DEP_GPGME], gpgme >= $LIBGPGME_DEPENDENCY, [], have_gpgme=no)
-    PKG_CHECK_MODULES([OT_DEP_GPG_ERROR], [gpg-error], [], have_gpgme=no)
+    PKG_CHECK_MODULES([OT_DEP_GPGME], [gpgme >= $LIBGPGME_DEPENDENCY gpg-error], [have_gpgme=yes], [have_gpgme=no])
     ]
 )
 AS_IF([test x$with_gpgme != xno && test x$have_gpgme != xyes], [