support/config-fragments/autobuild/bootlin-x86-64-glibc: use toolchain-external-bootlin

Until now the bootlin-x86-64-glibc was using a Bootlin toolchain as a
custom external toolchain. However, now that we have the
toolchain-external-bootlin package explicitly supporting Bootlin
toolchains as known toolchain profiles, it makes sense to use
that. Indeed, this will ensure that this autobuilder configuration
will use the latest available version of the Buildroot toolchain for
x86-64 glibc.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/config-fragments/autobuild/bootlin-x86-64-glibc.config

@@ -1,15 +1,5 @@
 BR2_x86_64=y
 BR2_x86_corei7=y
 BR2_TOOLCHAIN_EXTERNAL=y
-BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
-BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
-BR2_TOOLCHAIN_EXTERNAL_URL="http://toolchains.bootlin.com/downloads/releases/toolchains/x86-64-core-i7/tarballs/x86-64-core-i7--glibc--bleeding-edge-2020.02-2.tar.bz2"
-BR2_TOOLCHAIN_EXTERNAL_GCC_9=y
-BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_19=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
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_X86_64_CORE_I7_GLIBC_BLEEDING_EDGE=y