[Buildroot] [git commit branch/2022.02.x] package/gstreamer1/gst1-plugins-good: fix build with gcc 4.8

[Buildroot] [git commit branch/2022.02.x] package/gstreamer1/gst1-plugins-good: fix build with gcc 4.8

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=544f03b0f8c771dc42202a8c09de995d19934c71
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.02.x

Fix the following build failure with gcc 4.8 raised since bump to
version 1.20.0 in commit 34317969278d7b6d923d4889fb4235f112b2b201:

../ext/soup/gstsouploader.c: In function 'gst_soup_load_library':
../ext/soup/gstsouploader.c:219:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for (guint i = 0; i < len; i++) {
   ^

Fixes:
 - http://autobuild.buildroot.org/results/21792a9839d9722815075569123df8747fc450e3

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 288353ec746d91dd84e6abe76bf424909db82d1b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk b/package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk
index 1168feb293..2b6cf769aa 100644
--- a/package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk
+++ b/package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk
@@ -10,6 +10,7 @@ GST1_PLUGINS_GOOD_SITE = https://gstreamer.freedesktop.org/src/gst-plugins-good
 GST1_PLUGINS_GOOD_LICENSE_FILES = COPYING
 GST1_PLUGINS_GOOD_LICENSE = LGPL-2.1+
 
+GST1_PLUGINS_GOOD_CFLAGS = $(TARGET_CFLAGS) -std=gnu99
 GST1_PLUGINS_GOOD_LDFLAGS = $(TARGET_LDFLAGS) $(TARGET_NLS_LIBS)
 
 GST1_PLUGINS_GOOD_CONF_OPTS = \
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