Merge pull request #1119 from otegami/support-relative-path-for-pkg-config

Support relative path for CMAKE_INSTALL_*DIR

Author: redboltz

msgpack-c.pc.in

@@ -1,7 +1,7 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@
+libdir=${prefix}/@libdir@
+includedir=${prefix}/@includedir@
 
 Name: MessagePack
 Description: Binary-based efficient object serialization library