Ignore C4267: possible loss of data, there are too many of them

Change-Id: I4b01c9398c9c697cff63226269e7c7a3f5a5c9dd

solenv/gbuild/platform/com_MSC_defs.mk

@@ -87,6 +87,8 @@ gb_AFLAGS := $(AFLAGS)
 # C4251: 'identifier' : class 'type' needs to have dll-interface to be
 #   used by clients of class 'type2'
 
+# C4267: conversion from 'size_t' to 'type', possible loss of data
+
 # C4275: non-DLL-interface classkey 'identifier' used as base for
 #   DLL-interface classkey 'identifier'
 
@@ -149,6 +151,13 @@ gb_CFLAGS := \
 	-Zc:wchar_t- \
 	-Zm500 \
 
+ifeq ($(CPUNAME),X86_64)
+
+gb_CFLAGS += \
+	-wd4267 \
+
+endif
+
 gb_CXXFLAGS := \
 	-Gd \
 	-GR \