Mitigate Debian Trixie/Sid GCC/GNAT version mismatch

When I tested Debian Trixie, and Debian Sid, I saw that
GCC in PATH pointed to gcc-14, but gnat in path pointed
to GNAT-13, even if you manually install gnat-14.

GNAT 14 was marked experimental, but GCC 14 was marked
for use, in the apt repositories.

So this patch doesn't address the mismatch when doing e.g.
apt-get install gcc gnat

I will address the actual package dependency in a follow-up
patch, on the Debian dependencies config.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/lib.sh

@@ -95,6 +95,9 @@ if [ -z "${TMPDIR+x}" ]; then
 	export TMPDIR="/tmp"
 	export TMPDIR="$(mktemp -d -t xbmk_XXXXXXXX)"
 	touch lock || $err "cannot create 'lock' file"
+	rm -Rf xbmkpath || $err "cannot create xbmkpath"
+	mkdir -p xbmkpath || $err "cannot create xbmkpath"
+	export PATH="$PWD/xbmkpath:$PATH" || $err "Can't create xbmkpath"
 	xbmk_parent="y"
 fi