Merge branch 'da/pretty-tempname'

* da/pretty-tempname:
  diff: generate pretty filenames in prep_temp_blob()
  compat: add a basename() compatibility function
  compat: add a mkstemps() compatibility function

Conflicts:
	Makefile

t/t4020-diff-external.sh

@@ -136,6 +136,15 @@ test_expect_success 'GIT_EXTERNAL_DIFF with more than one changed files' '
 	GIT_EXTERNAL_DIFF=echo git diff
 '
 
+test_expect_success 'GIT_EXTERNAL_DIFF generates pretty paths' '
+	touch file.ext &&
+	git add file.ext &&
+	echo with extension > file.ext &&
+	GIT_EXTERNAL_DIFF=echo git diff file.ext | grep ......_file\.ext &&
+	git update-index --force-remove file.ext &&
+	rm file.ext
+'
+
 echo "#!$SHELL_PATH" >fake-diff.sh
 cat >> fake-diff.sh <<\EOF
 cat $2 >> crlfed.txt