File g-wrap-datarootdir.patch of Package g-wrap

--- guile/g-wrap-2.0-guile.pc.in
+++ guile/g-wrap-2.0-guile.pc.in
@@ -2,6 +2,7 @@
 
 prefix=@prefix@
 exec_prefix=@exec_prefix@
+datarootdir=@datarootdir@
 libdir=@libdir@
 includedir=@includedir@
 module_directory=@GUILEMODDIR@