package/libgee: needs gcc >= 4.9

Fix the following build failure raised since bump to version 0.20.5
in commit 10780e8d6df83d7a92b6dd3282e91fdc0ba369af and
https://gitlab.gnome.org/GNOME/libgee/-/commit/f0ccfe94ff731929e93601a38f931a12d52e5c2e:

task.c:59:1: error: initializer element is not constant
 static GOnce gee_task_data_async_pool = (GOnce) G_ONCE_INIT;
 ^

Fixes:
 - http://autobuild.buildroot.org/results/8354ea4192bcf2eb9c3be74d93b640db52ced10a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/granite/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_GRANITE
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # libgee
 	depends on BR2_PACKAGE_LIBGTK3
 	select BR2_PACKAGE_LIBGEE
 	select BR2_PACKAGE_LIBGLIB2
@@ -12,7 +13,8 @@ config BR2_PACKAGE_GRANITE
 
 	  https://github.com/elementary/granite
 
-comment "granite needs libgtk3 and a toolchain w/ wchar, threads"
+comment "granite needs libgtk3 and a toolchain w/ wchar, threads, gcc >= 4.9"
 	depends on BR2_USE_MMU
 	depends on !BR2_PACKAGE_LIBGTK3 || !BR2_USE_WCHAR \
-		|| !BR2_TOOLCHAIN_HAS_THREADS
+		|| !BR2_TOOLCHAIN_HAS_THREADS \
+		|| !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9

package/libgee/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_LIBGEE
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 	select BR2_PACKAGE_LIBGLIB2
 	help
 	  Libgee is an utility library providing GObject-based
@@ -10,6 +11,7 @@ config BR2_PACKAGE_LIBGEE
 
 	  https://wiki.gnome.org/Projects/Libgee
 
-comment "libgee needs a toolchain w/ wchar, threads"
+comment "libgee needs a toolchain w/ wchar, threads, gcc >= 4.9"
 	depends on BR2_USE_MMU
-	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_9