Merge branch 'mg/mingw-test-fix'

An earlier adjustment of test mistakenly used write_script
to prepare a file whose exact content matters for the test;
reverting that part fixes the breakage for those who use
SHELL_PATH that is different from /bin/sh.

* mg/mingw-test-fix:
  t9100: fix breakage when SHELL_PATH is not /bin/sh

t/t9100-git-svn-basic.sh

@@ -30,7 +30,8 @@ test_expect_success \
 		echo "deep dir" >dir/a/b/c/d/e/file &&
 		mkdir bar &&
 		echo "zzz" >bar/zzz &&
-		write_script exec.sh </dev/null &&
+		echo "#!/bin/sh" >exec.sh &&
+		chmod +x exec.sh &&
 		svn_cmd import -m "import for git svn" . "$svnrepo" >/dev/null
 	) &&
 	rm -rf import &&