Add native GDB client support for ARCv3

[jzbydniewski]

Using ARCv3, in release 2023.09 I cannot enable option "BR2_PACKAGE_GDB_DEBUGGER". In Config.in I can see this line

config BR2_PACKAGE_GDB_DEBUGGER
	bool "full debugger"
	depends on BR2_USE_WCHAR
	depends on !BR2_sh && !(BR2_arc64 || BR2_arc32)
	select BR2_PACKAGE_GMP if !BR2_GDB_VERSION_10
	select BR2_PACKAGE_NCURSES
	select BR2_PACKAGE_ZLIB

Is this really not supported for arc32 or just leftover ? For comparison, branch arc64 doesn't have this limitations

config BR2_PACKAGE_GDB_DEBUGGER
	bool "full debugger"
	depends on BR2_USE_WCHAR
	depends on !BR2_sh
	select BR2_PACKAGE_GMP if !BR2_GDB_VERSION_10 && !BR2_arc
	select BR2_PACKAGE_NCURSES
	select BR2_PACKAGE_ZLIB

If really not supported, can you please add support ?

[shahab-vahedi]

There's no native GDB client support in ARCv3 (yet).