support/config-fragments: replace br-i386-pentium-mmx-musl

Replace br-i386-pentium-mmx-musl by bootlin-x86-i686-musl to avoid the
following build failure with efivar and musl < 1.2.3 as suggested in
https://patchwork.ozlabs.org/project/buildroot/patch/20240303171115.1140763-1-ju.o@free.fr:

/home/buildroot/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/i586-buildroot-linux-musl/9.3.0/../../../../i586-buildroot-linux-musl/bin/ld: ./libefisec.so: undefined reference to `qsort_r'

Fixes:
 - http://autobuild.buildroot.org/results/a0ed3970da8a84d884b26c081b49b8d2b7208829

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit a8be4a04ade8e695c5c4d4a825253d69e80693f9)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/config-fragments/autobuild/bootlin-x86-i686-musl.config

@@ -0,0 +1,4 @@
+BR2_i386=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_X86_I686_MUSL_STABLE=y

support/config-fragments/autobuild/br-i386-pentium-mmx-musl.config

@@ -1,10 +0,0 @@
-BR2_x86_pentium_mmx=y
-BR2_TOOLCHAIN_EXTERNAL=y
-BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
-BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
-BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.net/toolchains/tarballs/br-i386-pentium-mmx-musl-2020.11.2.tar.bz2"
-BR2_TOOLCHAIN_EXTERNAL_GCC_9=y
-BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_9=y
-BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL=y
-# BR2_TOOLCHAIN_EXTERNAL_HAS_SSP is not set
-BR2_TOOLCHAIN_EXTERNAL_CXX=y

support/config-fragments/autobuild/toolchain-configs.csv

@@ -39,6 +39,7 @@ support/config-fragments/autobuild/bootlin-s390x-z13-glibc.config,x86_64
 support/config-fragments/autobuild/bootlin-sh4-uclibc.config,x86_64
 support/config-fragments/autobuild/bootlin-sparc-uclibc.config,x86_64
 support/config-fragments/autobuild/bootlin-sparc64-glibc.config,x86_64
+support/config-fragments/autobuild/bootlin-x86-i686-musl.config,x86_64
 support/config-fragments/autobuild/bootlin-x86-64-glibc.config,x86_64
 support/config-fragments/autobuild/bootlin-x86-64-uclibc.config,x86_64
 support/config-fragments/autobuild/bootlin-xtensa-uclibc.config,x86_64
@@ -50,7 +51,6 @@ support/config-fragments/autobuild/br-arm-internal-full.config,any
 support/config-fragments/autobuild/br-arm-internal-glibc.config,any
 support/config-fragments/autobuild/br-arm-internal-musl.config,any
 support/config-fragments/autobuild/br-i386-pentium4-full.config,x86_64
-support/config-fragments/autobuild/br-i386-pentium-mmx-musl.config,x86_64
 support/config-fragments/autobuild/br-microblazeel-full-internal.config,any
 support/config-fragments/autobuild/br-mips64-n64-full.config,x86_64
 support/config-fragments/autobuild/br-mips64r6-el-hf-glibc.config,x86_64