sys-devel/gdb: fix cross build issues with configuring gmp libs

As gdb 11 or newer requires gmp libs as dependency, a cross build of
gdb 11.2 started to fail when its configure scripts try to detect if
gmp exists.  The failure occurs mainly because the build still passes
'-L/usr/lib64` to LDFLAGS. Let's say, for example, host toolchains
outside of sysroot have amd64 libs, while the target inside of
sysroot should have arm64 libs. However, configure scripts of gdb 11.2
still try to find its libs outside of sysroot, /usr/lib64, although it
should find its libs inside of sysroot, e.g. /build/arm64/usr/lib64.

To fix the cross build issues, pass --with-sysroot as well as --libdir,
correctly with ${ESYSROOT}.

As a side note, for some reason, upstream gdb configure scripts are not
able to correctly make use of its gmp-specific options like --with-gmp
or --with-gmp-lib. Passing those options does not bring anything.
Also configure must have both --with-sysroot and --libdir, to make the
build work.

Signed-off-by: Dongsu Park <dpark@linux.microsoft.com>
Closes: https://github.com/gentoo/gentoo/pull/25896
Signed-off-by: Sam James <sam@gentoo.org>

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