Define __USE_MINGW_ANSI_STDIO for windows build

Some printf/scanf functions in Windows aren't C99 compatible.
Define __USE_MINGW_ANSI_STDIO for mingw compiler to use it's own set of
replacement libraries which are more C99-like.

Change-Id: I51dfa582971ec0487409067e8bb7fe3a44577b93
diff --git a/core/combo/HOST_windows-x86.mk b/core/combo/HOST_windows-x86.mk
index 1709711..cd047a1 100644
--- a/core/combo/HOST_windows-x86.mk
+++ b/core/combo/HOST_windows-x86.mk
@@ -42,7 +42,7 @@
 
 # Workaround differences in inttypes.h between host and target.
 # See bug 12708004.
-HOST_GLOBAL_CFLAGS += -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS
+HOST_GLOBAL_CFLAGS += -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -D__USE_MINGW_ANSI_STDIO
 
 HOST_CC := $(TOOLS_PREFIX)gcc$(TOOLS_EXE_SUFFIX)
 HOST_CXX := $(TOOLS_PREFIX)g++$(TOOLS_EXE_SUFFIX)