[Bug 237427] lang/ldc: update to 1.15.0, unbreak on aarch64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237427

            Bug ID: 237427
           Summary: lang/ldc: update to 1.15.0, unbreak on aarch64
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: acm at FreeBSD.org
          Reporter: greg at unrelenting.technology
          Assignee: acm at FreeBSD.org
             Flags: maintainer-feedback?(acm at FreeBSD.org)

Created attachment 203847
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=203847&action=edit
ldc115.patch

and use ninja to build the bootstrap compiler quickly and in parallel.

v1.15.0 relnotes: https://github.com/ldc-developers/ldc/releases/tag/v1.15.0

This version brings LLVM 8 support, however not in ltsmaster it seems:

FAILED: dmd2/impcnvgen 
: && /usr/bin/c++     CMakeFiles/impcnvgen.dir/dmd2/impcnvgen.c.o  -o
dmd2/impcnvgen   && :
ld: error: undefined symbol: llvm::DisableABIBreakingChecks

Might be worth it to use LLVM 7 for bootstrap and 8 for the final compiler. And
to rebuild the final compiler with itself because the lowmem option (see
relnotes) sounds pretty cool. But I'm not very interested in all that right
now, that's just notes for later.

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