validate context CF TypeID
explicit non-NULL test
GSS_C_CRED_NO_UI support.
Always have CFRuntime.h now
CoreFOundation headers always present now
always have CoreFoundation private headers
fix for current Heimdals, breaks older
update to build mech_browserid with xcode
fix MIT regressions
Merge branch 'browserid' of github.com:PADL/libbrowserid into browserid
more MIT regression fixes
Merge branch 'browserid' into browserid-sad

Conflicts:
	BrowserID.xcodeproj/project.pbxproj
use a single prefix header
Merge branch 'browserid' into browserid-sad

Conflicts:
	BrowserID.xcodeproj/project.pbxproj
check for HAVE_CONFIG_H
Merge branch 'browserid' into browserid-sad