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git/save: disallow modifying submodules in commits

if you want to touch submodules, use unix git: we
support them enough that repositories would work,
but we don't support them enough to modify them.

--- a/save.c

+++ b/save.c

@@ -254,6 +254,8 @@

 		e = dirent(&ent, &nent, elt);

 		if(e->islink)

 			sysfatal("symlinks may not be modified: %s", *path);

+		if(e->ismod)

+			sysfatal("submodules may not be modified: %s", *path);

 		if(isdir){

 			e->mode = DMDIR | 0755;

 			sub[nsub] = readobject(e->h);