Makefile.in: Set the myfulldir and mydir variables (which are relative

Makefile.in: Set the myfulldir and mydir variables (which are relative
	to buildtop and thisconfigdir, respectively.)

configure.in: Remove KRB5_POSIX_LOCKS test.

win_store.c (krb__get_srvtabname):
g_cnffile.c: Use krb5__krb4_context instead of init'ing and free'ing a
	krb5_context each time we need to read data from the configuration
	file.  We also define krb5__krb4_context in g_cnnfile.c, since it's a
	likely that any use of the krb4 library will pull in that file.

tf_util.c (tf_init): Use krb5_lock_file instead of trying to roll our
	own flock emulation.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@11026 dc483132-0cff-0310-8789-dd5450dbe970