[Midnightbsd-cvs] mports: gcc.mk: Remove 4.3 and 4.5 references as we dropped the former

[laffer1 at midnightbsd.org]

Log Message:
-----------
Remove 4.3 and 4.5 references as we dropped the former and never got the latter going.

Prepare for a gcc 4.7 port.

Modified Files:
--------------
    mports/Mk/extensions:
        gcc.mk (r1.6 -> r1.7)
        (http://cvsweb.midnightbsd.org/mports/Mk/extensions/gcc.mk?r1=1.6&r2=1.7)