gdb: Needs threads support

Fixes
http://autobuild.buildroot.org/results/480ee3efd8ffe8043329fec173ef8187bd54e0fb/build-end.log

[Peter: correct autobuilder URL]
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/gdb/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_GDB
 	bool "Build gdb debugger for the Target"
 	select BR2_PACKAGE_NCURSES
 	depends on BR2_USE_WCHAR
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_sh && !BR2_sh64 && !BR2_avr32 && !BR2_microblaze && !BR2_bfin && !BR2_aarch64
 	# The newest versions of gdb require thread debugging in the
 	# toolchain. The only cases for which this is not needed is if
@@ -15,8 +16,8 @@ config BR2_PACKAGE_GDB
 	help
 	    Build the full gdb debugger to run on the target.
 
-comment "Gdb debugger for the target needs WCHAR support in toolchain"
-	depends on !BR2_USE_WCHAR
+comment "Gdb for the target needs WCHAR and threads support in toolchain"
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
 
 config BR2_PACKAGE_GDB_SERVER
 	bool "Build gdb server for the Target"