crochet update to lib/freebsd_xdev.sh

[George Rosamond]

Note this:

https://github.com/kientzle/crochet-freebsd/commit/cdc90ae78a68edd576586cced453a3b282205772

Running:

make XDEV=arm XDEV_ARCH=armv6 WITH_GCC=1 WITH_GCC_BOOTSTRAP=1
WITH_GNUCXX=1 WITHOUT_CLANG=1 WITHOUT_CLANG_BOOTSTRAP=1
WITHOUT_CLANG_IS_CC=1 WITHOUT_TESTS=1 xdev

Same results for building xdev tools:

usr/src/gnu/usr.bin/cc/cc1plus/../../../../contrib/gcc/cp/except.c:(.text+0x10fb):
undefined reference to `libc_name_p'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** Error code 1

Stop.
make[3]: stopped in /usr/src/gnu/usr.bin/cc/cc1plus
*** Error code 1

Stop.
make[2]: stopped in /usr/src/gnu/usr.bin/cc
*** Error code 1

Stop.
make[1]: stopped in /usr/src
*** Error code 1

Stop.
make: stopped in /usr/src

g