gcc: Update to version 4.9.1
pakfire: Enable more hardening

Enables -fstack-protector-strong by default, which is supported
since GCC 4.9.
kernel: Enable -fstack-protector-strong
bash: Update to 4.3

Updated because of the old version won't compile with GCC 4.9,
but also fixes CVE-2014-6271, CVE-2014-7169, and #10631.
libusb: Update to 1.0.19
Merge branch 'gcc-4.9'