embedded.scm: Formatting.
(make-gcc-phase-pre-configure): Remove dynamic-linker argument. Create
gcc/config. Remove obsolete patch of gcc/configure.
(make-gcc-configure-flags): Add dynamic-linker argument. Simplify --with-specs
options and overwrite the dynamic-linker. Set --with-local-prefix to $#output
to ignore /usr/local/include.
(make-gcc): Update to GCC 14.2. Remove creation of --with-local-prefix
directory. Delete install-tools after install phase.
(make-gcc-cross-sans-libc-configure-flags): Add --disable-multiarch. Set
--with-local-prefix to $#output to ignore /usr/local/include.
(make-cross-c-library): Set
--with-local-prefix to $#output to ignore /usr/local/include. Change
--with-specs to work with multilibs. Add --disable-multiarch.