Bug 554521: scanner generates wrong names for enum members with

	Bug 554521: scanner generates wrong names for enum members with
	full type name prefix

	* giscanner/utils.py (strip_common_prefix): Fix this to strip the
	right amount when the entire "first" string is a prefix of
	"second"

	* tests/scanner/foo.h (FooEnumFullname):
	* tests/scanner/foo-expected.gir: test that

svn path=/trunk/; revision=640