[Bug 242389] lang/ocaml: fix build on powerpc64 elfv2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242389

            Bug ID: 242389
           Summary: lang/ocaml: fix build on powerpc64 elfv2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org
                CC: michipili at gmail.com
                CC: michipili at gmail.com
             Flags: maintainer-feedback?(michipili at gmail.com)

Created attachment 209630
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=209630&action=edit
patch

LLVM miscompiles ocaml on powerpc64 elfv2:
ld: error: bytecomp/printlambda.ml:23:(.text+0x16): relocation R_PPC64_TOC16_DS
out of range: 73024 is not in [-32768, 32767]

Use GCC instead. I tested on amd64 that it compiles successfully.

Add a conditional patch enabled only on powerpc64 elfv2 to use elfv2 abi
instead of elfv1.

Add a bunch of other patches to correctly check for abi instead of relying on
endianness.

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