cmake: fix wrong condition again.

CMakeLists.txt

@@ -57,7 +57,14 @@ else()
 	option(64BIT "Disable auto -m32 appending to compiler flags" ON)
 endif()
 
-if ((WIN32 OR ${CMAKE_SYSTEM_NAME} STREQUAL "Linux" OR APPLE) AND NOT 64BIT)
+# It seems CMAKE_SYSTEM_PROCESSOR parameter completely useless for APPLE platform,
+# so may need to set options here manually.
+if((WIN32 OR ${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+	AND (((CMAKE_SYSTEM_PROCESSOR STREQUAL "x64"
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64"
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64") AND NOT 64BIT)
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "x86"
+	OR CMAKE_SYSTEM_PROCESSOR STREQUAL "i386"))
 	option(GOLDSOURCE_SUPPORT "Build goldsource compatible client library" ON)
 else()
 	option(GOLDSOURCE_SUPPORT "Build goldsource compatible client library" OFF)