Add pkg-config definition for libmctp

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Change-Id: I276caf181d398d1b4a217f2ff59e5e7d31b47b6a
diff --git a/Makefile.am b/Makefile.am
index ed2d4dd..c224064 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,6 +18,8 @@
 bin_PROGRAMS = utils/mctp-demux-daemon
 utils_mctp_demux_daemon_LDADD = libmctp.la
 
+pkgconfig_DATA = libmctp.pc
+
 TESTS = $(check_PROGRAMS)
 
 check_PROGRAMS = tests/test_eid tests/test_seq