Bug 1152079 - Remove references to deleted Purify files from moz.build. r=bustage

xpcom/base/moz.build

@@ -65,9 +65,6 @@ if CONFIG['OS_ARCH'] == 'WINNT':
     EXPORTS += [
         'nsWindowsHelpers.h',
     ]
-    if CONFIG['MOZ_DEBUG']:
-        EXPORTS += ['pure.h']
-        SOURCES += ['pure_api.c']
 
 EXPORTS.mozilla += [
     'AvailableMemoryTracker.h',