Bug 1082323 - Reject pymake in client.mk. r=mshal

client.mk

@@ -91,8 +91,14 @@ convert it to Unix-style line endings, check \
 "https://developer.mozilla.org/en-US/docs/Developer_Guide/Mozilla_build_FAQ\#Win32-specific_questions" \
 for a workaround of this issue.)
 endif
+
+# Set this for baseconfig.mk
+HOST_OS_ARCH=WINNT
 endif
 
+# Include baseconfig.mk for its $(MAKE) validation.
+include $(TOPSRCDIR)/config/baseconfig.mk
+
 ####################################
 # Load mozconfig Options