hg: macosx-port/macosx-port/jdk: Don't check $CC -dumpspecs on macosx

[astrange at apple.com]

Changeset: f32df3148dcb
Author:    astrange
Date:      2011-07-12 12:59 -0700
URL:       http://hg.openjdk.java.net/macosx-port/macosx-port/jdk/rev/f32df3148dcb

Don't check $CC -dumpspecs on macosx

clang doesn't support it and we always know the answer for gcc,
so this saves time and fixes a large number of clang warnings.

! make/common/Defs-bsd.gmk