toolchain/toolchain-external/toolchain-external-codescape-mti-mips: disable gdbserver

Fix the following build failure:

>>> toolchain-external-codescape-mti-mips 2018.09-02 Copying gdbserver
Could not find gdbserver in external toolchain

Fixes:
 - http://autobuild.buildroot.org/results/ead304285a9cf32bf6b9dcc7fc30acece25ec680

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f7ebab67abc24b48035868dbaf2c362f47118a9a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/toolchain-external/toolchain-external-codescape-mti-mips/Config.in

@@ -5,6 +5,7 @@ config BR2_TOOLCHAIN_EXTERNAL_CODESCAPE_MTI_MIPS
 	depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
 	depends on BR2_MIPS_CPU_MIPS32R2 || (BR2_MIPS_CPU_MIPS64R2 && !BR2_MIPS_SOFT_FLOAT)
 	select BR2_TOOLCHAIN_EXTERNAL_GLIBC
+	select BR2_TOOLCHAIN_EXTERNAL_HAS_NO_GDBSERVER
 	select BR2_INSTALL_LIBSTDCPP
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_6