* gssapiP_generic.h: If not on a Mac or under Dos, and stdlib.h

	* gssapiP_generic.h: If not on a Mac or under Dos, and stdlib.h
		exists, include it.

	* configure.in: Check for stdlib.h

This cleans up many warnings on the Alpha as malloc is not previously
declared. In Beta-6, gssapiP_generic.h always included k5-int.h (which
included stdlib.h). Now, only the DOS and Mac platforms include k5-int.h
so we need to include stdlib.h if present.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@8895 dc483132-0cff-0310-8789-dd5450dbe970