NEX-5204 silence lint and studio warnings that only occur with an adjunct proto
Reviewed by: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>

@@ -69,5 +69,7 @@
 CERRWARN +=             -_gcc=-Wno-unused-value
 CERRWARN +=             -_gcc=-Wno-extra
 CERRWARN +=             -_gcc=-Wno-parentheses
 CERRWARN +=             -_gcc=-Wno-address
 CERRWARN +=             -_gcc=-Wno-unused-function
+
+CERRWARN +=     -_cc=-errhdr=no%$(ADJUNCT_PROTO)/usr/include/glib-2.0