pkg/55005: lang/zig: build fails due to pulling in LLVM-9, when =LLVM-8 is required

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>Number:         55005
>Category:       pkg
>Synopsis:       lang/zig: build fails due to pulling in LLVM-9, when =LLVM-8 is required
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 22 18:55:00 +0000 2020
>Originator:     Dean Matzkov
>Release:        2019-Q4
>Organization:
>Environment:
>Description:
lang/zig fails to build due to requiring exactly LLVM-8, while the Makefile pulls-in LLVM-9, as such:

----SNIP----
Configuring zig version 0.4.0+
CMake Error at cmake/Findllvm.cmake:35 (message):
  expected LLVM 8.x but found 9.0.0
----/SNIP----
>How-To-Repeat:

>Fix:
Bumping from zig-0.4.0 to zig-0.5.0 could work, since they bumped their LLVM requirement to LLVM-9:

https://ziglang.org/download/0.5.0/release-notes.html#LLVM-9