Backing out change that was not properly reviewed or bugzilla'd. Sorry guys.

xpcom/reflect/xptcall/src/md/unix/xptcinvoke_arm.cpp

@@ -39,7 +39,7 @@
 
 #include "xptcprivate.h"
 
-#if !defined(__arm__)
+#if !defined(LINUX) || !defined(__arm__)
 #error "This code is for Linux ARM only. Check that it works on your system, too.\nBeware that this code is highly compiler dependent."
 #endif
 

xpcom/reflect/xptcall/src/md/unix/xptcstubs_arm.cpp

@@ -41,7 +41,7 @@
 #include "xptcprivate.h"
 #include "xptiprivate.h"
 
-#if !defined(__arm__)
+#if !defined(LINUX) || !defined(__arm__)
 #error "This code is for Linux ARM only. Please check if it works for you, too.\nDepends strongly on gcc behaviour."
 #endif