SDL_image: test: Use install(1) more portably

From cce3ddfee89a9f143eb2943e8fc2b80c8d7bc91b Mon Sep 17 00:00:00 2001
From: Simon McVittie <[EMAIL REDACTED]>
Date: Fri, 20 May 2022 19:39:33 +0100
Subject: [PATCH] test: Use install(1) more portably

I'd assumed this was only going to be useful on Linux, but the CI is
now using it on macOS too.

Signed-off-by: Simon McVittie <smcv@collabora.com>
---
 test/Makefile.am | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/Makefile.am b/test/Makefile.am
index 7f55eb9..840d1ed 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -64,7 +64,8 @@ generatetestmeta:
 
 install-data-hook: installtestmeta
 installtestmeta: generatetestmeta
-	install -m644 -D -t $(DESTDIR)$(testmetadir) *.test
+	install -d $(DESTDIR)$(testmetadir)
+	install -m644 *.test $(DESTDIR)$(testmetadir)
 
 clean-local:
 	rm -f *.test