passing arguments to build-gcc

[i-n-g-o]

trafficstars

hi.

with this change it was able to pass additional arguments to gccs configure script. on osx i needed to specify the path for gmp, mpfr and mpc...

i could compile everything in on go with: ./build-elf.sh lx106 --with-mpc=/opt/local --with-mpfr=/opt/local --with-gmp=/opt/local

[i-n-g-o]

ping

[jcmvbkbc]

@i-n-g-o please consider using https://github.com/jcmvbkbc/crosstool-NG or, better, https://github.com/pfalcon/esp-open-sdk instead of these scripts.

[i-n-g-o]

@jcmvbkbc thanks for the info