platform.h: explicitly undefine all 'TARGET_*' macros before detection

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Author: tycho

platform.h

@@ -26,6 +26,32 @@
 #undef COMPILER_DETECTED
 #undef OS_DETECTED
 
+#undef TARGET_CPU_ALPHA
+#undef TARGET_CPU_ARM
+#undef TARGET_CPU_IA64
+#undef TARGET_CPU_PPC
+#undef TARGET_CPU_SPARC
+#undef TARGET_CPU_X64
+#undef TARGET_CPU_X86
+#undef TARGET_CPU_X86_64
+
+#undef TARGET_COMPILER_BORLAND
+#undef TARGET_COMPILER_CYGWIN
+#undef TARGET_COMPILER_GCC
+#undef TARGET_COMPILER_ICC
+#undef TARGET_COMPILER_MINGW
+#undef TARGET_COMPILER_MSVC
+
+#undef TARGET_OS_FREEBSD
+#undef TARGET_OS_HAIKU
+#undef TARGET_OS_LINUX
+#undef TARGET_OS_MACOSX
+#undef TARGET_OS_NDSFIRMWARE
+#undef TARGET_OS_NETBSD
+#undef TARGET_OS_OPENBSD
+#undef TARGET_OS_SOLARIS
+#undef TARGET_OS_WINDOWS
+
 /* ------------------- *
 * PROCESSOR DETECTION *
 * ------------------- */