[Bug 210928] lang/gcc{48,49,5} lacks -fformat-extensions support; can't be effectively used with make buildkernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210928

            Bug ID: 210928
           Summary: lang/gcc{48,49,5} lacks -fformat-extensions support;
                    can't be effectively used with make buildkernel
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

Long story short, I tried to run "make buildkernel" with gcc{48,49,5} and it
failed due to missing "-fformat-extensions" support in the compiler (a feature
which is present in base). I added a check to kern.mk to only use
-fformat-extensions with the base version of gcc in r302403, but that
unfortunately tripped a failure threshold with gcc, which prompted me to back
out the change in r302438.

-fformat-extensions should be added to all of our compilers for consistency.

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