support/testing: test_syslinux: remove BR2_TOOLCHAIN_EXTERNAL_LOCALE

The BR2_TOOLCHAIN_EXTERNAL_LOCALE is only defined for uClibc based
custom external toolchains.

The test_syslinux is using a glibc toolchain, so the
"# BR2_TOOLCHAIN_EXTERNAL_LOCALE is not set" line disapear from
the generated dot config (.config) leading to an error due to
a new check in the testsuite infra.

There is the same problem with:
BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG=y
BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS=y
BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_NPTL=y

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/boot/test_syslinux.py

@@ -24,12 +24,8 @@ class TestSysLinuxBase(infra.basetest.BRTest):
         BR2_TOOLCHAIN_EXTERNAL_URL="http://toolchains.bootlin.com/downloads/releases/toolchains/x86-64-core-i7/tarballs/x86-64-core-i7--glibc--stable-2018.11-1.tar.bz2"
         BR2_TOOLCHAIN_EXTERNAL_GCC_7=y
         BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_1=y
-        # BR2_TOOLCHAIN_EXTERNAL_LOCALE is not set
         BR2_TOOLCHAIN_EXTERNAL_CXX=y
         BR2_TOOLCHAIN_EXTERNAL_HAS_SSP=y
-        BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG=y
-        BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS=y
-        BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_NPTL=y
         BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
         """