Detecting fails, remove the ubuntu bits

Signed-off-by: Thomas Backlund <tmb@mageia.org>

--- a/tools/perf/ui/libslang.h
+++ b/tools/perf/ui/libslang.h
@@ -11,11 +11,7 @@
 #define HAVE_LONG_LONG __GLIBC_HAVE_LONG_LONG
 #endif
 
-#ifdef HAVE_SLANG_INCLUDE_SUBDIR
 #include <slang/slang.h>
-#else
-#include <slang.h>
-#endif
 
 #if SLANG_VERSION < 20104
 #define slsmg_printf(msg, args...) \