Try and fix the dependency/bootstrap issues in kerberos5

libkafs5 needs a header from libkrb5, it includes this from
${.OBJDIR}/mumble, this used to work fine as long as you happen to have
a krb_err.h in your base system, this doesn't work for bootstrapping or
using a cross-compiler with a different sysroot. This is just a
best-effort bandaid, sufficient parallelism can still break it.

Fix a SRCS override that dropped krb5_err.h.

Discussed with:	stas

kerberos5/lib/Makefile

@@ -2,7 +2,9 @@
 # $FreeBSD$
 
 SUBDIR=	libasn1 libgssapi_krb5 libgssapi_ntlm libgssapi_spnego libhdb \
-	libheimntlm libhx509 libkadm5clnt libkadm5srv libkafs5 libkrb5 \
+	libheimntlm libhx509 libkadm5clnt libkadm5srv libkrb5 \
 	libroken libsl libvers libkdc libwind libheimsqlite libheimbase libheimipcc libheimipcs
 
+SUBDIR+= libkafs5  # requires krb_err.h from libkrb5
+
 .include <bsd.subdir.mk>

kerberos5/lib/libkafs5/Makefile

@@ -24,9 +24,6 @@ MLINKS=	kafs5.3 k_afs_cell_of_file.3 \
 	kafs5.3 krb_afslog_uid.3
 
 SRCS=	afssys.c afskrb5.c common.c krb5_err.h
-SRCS=	afssys.c \
-	afskrb5.c \
-	common.c
 
 CFLAGS+=	-I${KRB5DIR}/lib/kafs \
 		-I${KRB5DIR}/lib/krb5 \