package/gcc: restrict hs4x_rel31 to arc gcc fork

All the ARC variants are supported by upstream gcc, except for the
HS48 rel31 (hs4x_rel31) which is only supported by the ARC fork.

Fixes:
http://autobuild.buildroot.net/results/357a74d53af96d4b868a9d5b9f9ce9432e0c53b5
http://autobuild.buildroot.net/results/bcdf160a3d5ffcccd4402f65aca153faca4b32c2

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: ARC Maintainers <arc-buildroot@synopsys.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/gcc/Config.in.host

@@ -31,6 +31,8 @@ config BR2_GCC_VERSION_9_X
 	# upstream gcc. C-SKY gcc upstream support not tested
 	# with upstream binutils and glibc.
 	depends on !BR2_csky
+	# ARC HS48 rel 31 only supported by gcc arc fork.
+	depends on !BR2_archs4x_rel31
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_9
 
 config BR2_GCC_VERSION_10_X
@@ -43,6 +45,8 @@ config BR2_GCC_VERSION_10_X
 	# upstream gcc. C-SKY gcc upstream support not tested
 	# with upstream binutils and glibc.
 	depends on !BR2_csky
+	# ARC HS48 rel 31 only supported by gcc arc fork.
+	depends on !BR2_archs4x_rel31
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_10
 
 config BR2_GCC_VERSION_11_X
@@ -54,6 +58,8 @@ config BR2_GCC_VERSION_11_X
 	# that need to be reverted since gcc 8.4, 9.3 and 10.1.
 	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98784
 	depends on !BR2_sparc
+	# ARC HS48 rel 31 only supported by gcc arc fork.
+	depends on !BR2_archs4x_rel31
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_11
 
 endchoice