Add TDE pkg config path into PKG_CONFIG_PATH variable.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

ConfigureChecks.cmake

@@ -25,6 +25,11 @@ if( WITH_GCC_VISIBILITY )
 endif( WITH_GCC_VISIBILITY )
 
 
+##### set PKG_CONFIG_PATH #######################
+
+set( ENV{PKG_CONFIG_PATH} "${PKG_CONFIG_PATH}:$ENV{PKG_CONFIG_PATH}:${LIB_INSTALL_DIR}/pkgconfig" )
+
+
 ##### look for tdegames
 
 pkg_search_module( TDEGAMES libtdegames )