Update binutils, gcc, newlibc, and gdb
Update binutils, gcc, newlibc, and gdb

- binutils 2.23.1
- gcc 4.7.2
  - gmp 5.0.5
  - mpfr 3.0.1
  - mpc 1.0.1
- newlibc 2.0.0
- gdb 7.5.1

tgtakaoka/scripts-cortex