Add support for pkg-config

[connman] / connman.pc.in

prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@
 
Name: connman
Description: Connection Manager
Version: @VERSION@
Libs: -module -avoid-version -export-symbols-regex connman_plugin_desc
Cflags: -I${includedir}