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git/merge: correctly preserve permissions when merging

when doing a 3 way merge of a file, we also need to do a
merge of the permission bits to avoid clobberign them.

--- a/sys/lib/git/common.rc

+++ b/sys/lib/git/common.rc

@@ -29,13 +29,23 @@

 	' $*

 }

-fn present {

+fn mergeperm {

 	if(~ $1 /dev/null && cmp $2 $3>/dev/null)

 		status=gone

 	if not if (~ $3 /dev/null && cmp $1 $2>/dev/null)

 		status=gone

-	if not

+	if not {

+		mergedperms='-x'

+		if(test -x $2){

+			if(test -x $1 -a -x $3)

+				mergedperms='+x'

+		}

+		if not{

+			if(test -x $1 -o -x $3)

+				mergedperms='+x'

+		}

 		status=()

+	}

 }

 fn whoami{

@@ -73,13 +83,13 @@

 		base=/dev/null

 	if(! test -f $theirs)

 		theirs=/dev/null

-	mkdir -p `{basename -d $tmp}

 	if(! ape/diff3 -3 -m $ours $base $theirs > $tmp)

 		echo merge needed: $out >[1=2]

-	if(present $ours $base $theirs){

+	if(mergeperm $ours $base $theirs){

 		mv $tmp $out

 		git/add $out

+		chmod $mergedperms $out

 	}

 	if not {

 		rm -f $tmp $out