toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101916

heirloom-mailx package fails to build for the SH4 architecture with
optimization enabled with gcc = 11.1.0:
http://autobuild.buildroot.net/results/911/911f5c024834741754102ff1bbb05c4a64c54a0b/

It's been reported upstream:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101916

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

toolchain/Config.in

@@ -197,6 +197,13 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_101915
 	bool
 	default y if BR2_microblaze
 
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101916
+# ICE: on SH4: Segmentation fault signal terminated program cc1.
+# This bug still exists in gcc = 11.1.0
+config BR2_TOOLCHAIN_HAS_GCC_BUG_101916
+	bool
+	default y if BR2_sh4
+
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool