package/gcc: remove legacy leftover for PR60102

Commit 2c8de6c4 (gcc 4.9.1: add patch for PR60102) removed the SPE
condition becasue of said PR, but forgot to remove the associated
comment, which has been tagging along all this time...

Remove it, it is no longer valid and causes confusion.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>