Fix building with cmake 3.1 (PREFIX, -fPIC related, boo#911875).

Adjusting to the change in the base package,
libyui/libyui@c4221b9

PROJECTINFO.cmake

@@ -16,15 +16,10 @@ SET( SUMMARY            "Libyui - Qt Package Selector" )
 SET( DESCRIPTION        "This package contains the Qt package selector\ncomponent for libYUI.\n" )
 
 
-
 ## Things to cleanup; probably too yast2 related
 
-IF( NOT PREFIX )
-  SET( PREFIX "/usr" )
-ENDIF( NOT PREFIX )
-
 # used in src/icons and YQPackageSelectorHelp.cc (via -DHELPIMAGEDIR) probably specific to this file
-SET( INSTALL_HELP_ICONS_DIR 	"${PREFIX}/share/YaST2/images" )
+SET( INSTALL_HELP_ICONS_DIR 	"${YPREFIX}/share/YaST2/images" )
 
 # maybe '#include <yui/Libyui_config.h>' rather than using '-DTHEMEDIR'
-SET( YUIQT_THEMEDIR		"${PREFIX}/share/YaST2/theme" )
+SET( YUIQT_THEMEDIR		"${YPREFIX}/share/YaST2/theme" )