cc/gcc: update Linaro GCC revisions to 2012.04

Update Linaro GCC with the latest available revisions.

The 4.7 revision is also released, but the infrastructure is not yet ready for
it in CT-NG.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>

 reporter_name="dsreed on freenode/#crosstool-ng"

 reporter_url=""

 reporter_comment="Enables experimental support for VFP/NEON hardware floating point."