[Buildroot] [PATCH 1/1] package/mongoose: fix build with gcc 4.8

[Fabrice Fontaine]

Fix the following build failure with gcc 4.8 raised since bump to
version 7.8 in commit f9e51e1150f59962577358b3da5c390ca4749291:

/home/buildroot/autobuild/run/instance-2/output-1/build/mongoose-7.8/mongoose.c: In function 'mg_iotest':
/home/buildroot/autobuild/run/instance-2/output-1/build/mongoose-7.8/mongoose.c:4484:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for (struct mg_connection *c = mgr->conns; c != NULL; c = c->next) {
   ^

Fixes:
 - http://autobuild.buildroot.org/results/c538c6d8e87e4e24097c9878ee15083802276505

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
 package/mongoose/mongoose.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/mongoose/mongoose.mk b/package/mongoose/mongoose.mk
index 8d06ed4689..0693f7553a 100644
--- a/package/mongoose/mongoose.mk
+++ b/package/mongoose/mongoose.mk
@@ -13,7 +13,7 @@ MONGOOSE_INSTALL_STAGING = YES
 # static library
 MONGOOSE_INSTALL_TARGET = NO
 
-MONGOOSE_CFLAGS = $(TARGET_CFLAGS)
+MONGOOSE_CFLAGS = $(TARGET_CFLAGS) -std=gnu99
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 MONGOOSE_DEPENDENCIES += openssl
-- 
2.39.0