[Bug 243180] security/afl: fix build on powerpc64 elfv2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243180

--- Comment #2 from Piotr Kubaj <pkubaj at FreeBSD.org> ---
(In reply to Tobias Kortkamp from comment #1)
I don't have aarch64 to test on, so I'll leave it up to you :)

afl needs -mabi=elfv2 because it uses LLVM 8. LLVM 9 has patches that for elfv2
that are autoapplied when building on elfv2, so that it doesn't use elfv1.

This is done with:
OPTIONS_DEFAULT_powerpc64=      ${PPC_ABI:tu:MELFV2} OPENMP
ELFV2_EXTRA_PATCHES=    ${PATCHDIR}/ppc64-elfv2
at https://svnweb.freebsd.org/ports/head/devel/llvm90/Makefile?view=markup
The extra patches are simply
https://svnweb.freebsd.org/ports/head/devel/llvm90/files/ppc64-elfv2/patch-lib_Target_PowerPC_PPCTargetMachine.cpp?view=markup
and
https://svnweb.freebsd.org/ports/head/devel/llvm90/files/ppc64-elfv2/patch-tools_clang_lib_Basic_Targets_PPC.h?view=markup

They just set up clang to build for elfv2. It can be done without those patches
by passing -mabi=elfv2.

LLVM 8 doesn't have those patches but can still build for elfv2 after passing
-mabi=elfv2.

If afl++ is the superior alternative to this port (with only pros and no cons),
then I guess it's fine not to fix it, but then why keep this port in the tree?
:)

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