Don't install the .pc file, which is already installed by main package

--- cmake/base.cmake.orig	2018-07-11 10:41:37.000000000 +0200
+++ cmake/base.cmake	2018-12-13 14:15:46.772836002 +0100
@@ -226,7 +226,7 @@
 #   finalize the project setup.
 #
 MACRO(SETUP_PROJECT_FINALIZE)
-  _SETUP_PROJECT_PKG_CONFIG_FINALIZE()
+  #_SETUP_PROJECT_PKG_CONFIG_FINALIZE()
   _SETUP_PROJECT_DOCUMENTATION_FINALIZE()
   _SETUP_PROJECT_HEADER_FINAlIZE()
   _SETUP_DEBIAN()