submodule: avoid dashed invocation

In the years-old effort to clean up the PATH a bit, we deprecated dashed
invocations.

But we did not hold ourselves to that. Until now.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

git-submodule.sh

@@ -860,7 +860,7 @@ cmd_summary() {
 				test $status != A && test $ignore_config = all && continue
 			fi
 			# Also show added or modified modules which are checked out
-			GIT_DIR="$sm_path/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
+			GIT_DIR="$sm_path/.git" git rev-parse --git-dir >/dev/null 2>&1 &&
 			printf '%s\n' "$sm_path"
 		done
 	)
@@ -894,11 +894,11 @@ cmd_summary() {
 		missing_dst=
 
 		test $mod_src = 160000 &&
-		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
+		! GIT_DIR="$name/.git" git rev-parse -q --verify $sha1_src^0 >/dev/null &&
 		missing_src=t
 
 		test $mod_dst = 160000 &&
-		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
+		! GIT_DIR="$name/.git" git rev-parse -q --verify $sha1_dst^0 >/dev/null &&
 		missing_dst=t
 
 		display_name=$(git submodule--helper relative-path "$name" "$wt_prefix")