gdb: not available on ARM noMMU and OpenRISC

Neither gdb nor gdbserver have support for ARM noMMU and OpenRISC, so
let's disable gdb on those architectures.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
Changes since v2:
 - Fixed BR2_openrisc to BR2_or1k in Config.in.host
Changes since v1:
 - Fixed BR2_openrisc to BR2_or1k

package/gdb/Config.in

@@ -1,8 +1,10 @@
 config BR2_PACKAGE_GDB_ARCH_SUPPORTS
 	bool
 	default y
+	depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
 	depends on !BR2_bfin
 	depends on !BR2_nios2
+	depends on !BR2_or1k
 
 comment "gdb/gdbserver needs a toolchain w/ threads, threads debug"
 	depends on BR2_PACKAGE_GDB_ARCH_SUPPORTS

package/gdb/Config.in.host

@@ -6,7 +6,9 @@ config BR2_PACKAGE_HOST_GDB
 	# allow to build a cross-gdb, as the one of the external
 	# toolchain should be used.
 	depends on !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY
+	depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
 	depends on !BR2_nios2
+	depends on !BR2_or1k
 	help
 	  Build a cross gdb that runs on the host machine and debugs
 	  programs running on the target. It requires 'gdbserver'