Bug 1522761 - Use CC_TYPE in C-C build files. mail/ and mailnews/ part. r=rjl

Ports:
Bug 1031352 [move most of the _MSC_VER references in Makefile.in to moz.build].
Bug 1394734 [Replace CONFIG['CLANG_CXX'], CONFIG['GNU_CXX'] by CONFIG['CC_TYPE']].

mail/app/moz.build

@@ -55,7 +55,7 @@ if CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
 # The heap will grow if need be.
 #
 # Set it to 256k.  See bug 127069.
-if CONFIG['OS_ARCH'] == 'WINNT' and not CONFIG['GNU_CC']:
+if CONFIG['OS_ARCH'] == 'WINNT' and CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
     LDFLAGS += ['/HEAP:0x40000']
 
 DisableStlWrapping()

mail/installer/Makefile.in

@@ -50,10 +50,6 @@ ifeq ($(MOZ_WIDGET_TOOLKIT),gtk3)
 DEFINES += -DMOZ_GTK=1
 endif
 
-ifdef _MSC_VER
-DEFINES += -D_MSC_VER=$(_MSC_VER)
-endif
-
 ifdef MOZ_SYSTEM_NSPR
 DEFINES += -DMOZ_SYSTEM_NSPR=1
 endif

mailnews/import/build/moz.build

@@ -36,7 +36,7 @@ if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
 if CONFIG['OS_ARCH'] == 'WINNT':
     LOCAL_INCLUDES += [
     ]
-    if not CONFIG['GNU_CC']:
+    if CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
         LOCAL_INCLUDES += [
             '../becky/src',
             '../outlook/src',

mailnews/moz.build

@@ -35,7 +35,7 @@ if CONFIG['OS_ARCH'] == 'WINNT':
     if CONFIG['MOZ_MAPI_SUPPORT']:
         DIRS += ['import/outlook/src']
 
-    if not CONFIG['GNU_CC']:
+    if CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
         DIRS += [
             'import/winlivemail',
         ]