[Bug 244504] devel/glslang: Fix build with clang 10.0.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244504

            Bug ID: 244504
           Summary: devel/glslang: Fix build with clang 10.0.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: greg at unrelenting.technology
            Blocks: 244251
                CC: greg at unrelenting.technology
             Flags: maintainer-feedback?(greg at unrelenting.technology)

Created attachment 212028
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212028&action=edit
Fix devel/glslang build with clang 10.0.0

As reported in bug 244251, with clang 10.0.0 the devel/glslang port fails to
build with:

In file included from MachineIndependent/glslang.y:60:
In file included from
/wrkdirs/usr/ports/devel/glslang/work/glslang-7.11.3214/glslang/MachineIndependent/SymbolTable.h:68:
In file included from
/wrkdirs/usr/ports/devel/glslang/work/glslang-7.11.3214/glslang/MachineIndependent/../Include/Common.h:108:
/wrkdirs/usr/ports/devel/glslang/work/glslang-7.11.3214/glslang/MachineIndependent/../Include/PoolAlloc.h:307:54:
error: 'operator=' is a private member of 'glslang::TPoolAllocator'
    void setAllocator(TPoolAllocator* a) { allocator = *a; }
                                           ~~~~~~~~~ ^ ~~
/wrkdirs/usr/ports/devel/glslang/work/glslang-7.11.3214/glslang/MachineIndependent/../Include/PoolAlloc.h:244:21:
note: declared private here
    TPoolAllocator& operator=(const TPoolAllocator&);  // don't allow
assignment operator
                    ^
1 error generated.

This can be fixed by applying an upstream commit from the glslang project:
https://github.com/KhronosGroup/glslang/commit/24b3e8384e93f3e73b6aa14ea00a30574112f9ba


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244251
[Bug 244251] [exp-run] Against projects/clang1000-import branch
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