pkg.m4: Bump the serial number for release

There aren't any significant changes here, but this will cause aclocal
to get the latest version.

1 files changed, 1 insertions, 1 deletions

diff --git a/pkg.m4.in b/pkg.m4.in
index 45427e9..9102bcf 100644
--- a/pkg.m4.in
+++ b/pkg.m4.in
@@ -1,5 +1,5 @@
 # pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-# serial 11 (pkg-config-@VERSION@)
+# serial 12 (pkg-config-@VERSION@)
 
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