Fixed bug 4928 - CMakeLists.txt: put cmake package helpers in proper libdir

Tiago O.

Use LIB_SUFFIX variable to determine the correct path.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e7ab00f..b3b2875 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2119,7 +2119,7 @@
 if (WINDOWS)
   set(PKG_PREFIX "cmake")
 else ()
-  set(PKG_PREFIX "lib/cmake/SDL2")
+  set(PKG_PREFIX "lib${LIB_SUFFIX}/cmake/SDL2")
 endif ()
 
 include(CMakePackageConfigHelpers)