Bugzilla bug 290122: pass full pathnames of source files to the compiler

on AIX so its debugger can automatically find the source files. r=Julien
Pierre of Sun and Philip Warren of IBM.

nsprpub/config/rules.mk

@@ -399,7 +399,7 @@ endif
 # debuggers under Windows and OS/2 to find source files automatically.
 #
 
-ifeq ($(OS_ARCH),OS2)
+ifeq (,$(filter-out AIX OS2,$(OS_ARCH)))
 NEED_ABSOLUTE_PATH = 1
 endif