Check for 64bit arch

Author: FreddieAkeroyd

CMakeLists.txt

@@ -273,6 +273,14 @@ endif()
 #
 
 # needed for windows NSIS installer
+if (CMAKE_SIZEOF_VOID_P MATCHES "8")
+    set(ARCH64 1)
+	set(ARCHSUFFIX "64")
+else()
+    set(ARCH64 0)
+	set(ARCHSUFFIX "")
+endif()
+
 file(TO_NATIVE_PATH ${PROJECT_SOURCE_DIR} PROJECT_SOURCE_DIR_NATIVE) 
 file(TO_NATIVE_PATH ${PROJECT_BINARY_DIR} PROJECT_BINARY_DIR_NATIVE) 
 string(REPLACE "\\" "\\\\" PROJECT_SOURCE_DIR_NATIVE_D ${PROJECT_SOURCE_DIR_NATIVE})