Disable compressed debug sections on i586-gnu

Compressed debug is enabled by default for gas (assembly) on Linux/x86
targets, and we started building our own in #102530, but that made our
`compiler_builtins` incompatible with binutils < 2.32. Add an explicit
option to disable that in our crosstool-ng config. Fixes #102703.

src/ci/docker/README.md

@@ -242,10 +242,14 @@ For targets: `i586-unknown-linux-gnu`
 - Operating System > Target OS = linux
 - Operating System > Linux kernel version = 3.2.101
 - Binary utilities > Version of binutils = 2.32
+- Binary utilities > binutils extra config = --enable-compressed-debug-sections=none -- (\*)
 - C-library > glibc version = 2.17.0
 - C compiler > gcc version = 8.3.0
 - C compiler > C++ = ENABLE
 
+(\*) Compressed debug is enabled by default for gas (assembly) on Linux/x86 targets,
+     but that makes our `compiler_builtins` incompatible with binutils < 2.32.
+
 ### `powerpc-linux-gnu.config`
 
 For targets: `powerpc-unknown-linux-gnu`

src/ci/docker/host-x86_64/dist-i586-gnu-i586-i686-musl/i586-linux-gnu.config

@@ -336,7 +336,7 @@ CT_BINUTILS_LINKERS_LIST="ld"
 CT_BINUTILS_LINKER_DEFAULT="bfd"
 # CT_BINUTILS_PLUGINS is not set
 CT_BINUTILS_RELRO=m
-CT_BINUTILS_EXTRA_CONFIG_ARRAY=""
+CT_BINUTILS_EXTRA_CONFIG_ARRAY="--enable-compressed-debug-sections=none"
 # CT_BINUTILS_FOR_TARGET is not set
 CT_ALL_BINUTILS_CHOICES="BINUTILS"