PGI: Pass macOS-specific link flags directly to linker

The PGI compiler on macOS does not support some macOS-specific flags so
pass them through `-Wl,` to the linker directly.

Issue: #16457

Modules/Platform/Darwin-PGI-C.cmake

+include(Platform/Darwin-PGI)
+__darwin_compiler_pgi(C)

Modules/Platform/Darwin-PGI-CXX.cmake

+include(Platform/Darwin-PGI)
+__darwin_compiler_pgi(CXX)

Modules/Platform/Darwin-PGI-Fortran.cmake

+include(Platform/Darwin-PGI)
+__darwin_compiler_pgi(Fortran)

Modules/Platform/Darwin-PGI.cmake

+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# This module is shared by multiple languages; use include blocker.
+if(__DARWIN_COMPILER_PGI)
+  return()
+endif()
+set(__DARWIN_COMPILER_PGI 1)
+
+macro(__darwin_compiler_pgi lang)
+  set(CMAKE_${lang}_OSX_COMPATIBILITY_VERSION_FLAG "-Wl,-compatibility_version,")
+  set(CMAKE_${lang}_OSX_CURRENT_VERSION_FLAG "-Wl,-current_version,")
+  set(CMAKE_SHARED_LIBRARY_SONAME_${lang}_FLAG "-Wl,-install_name")
+endmacro()