Platform: add flag definitions for PathScale compiler on SunOS (#16135)

Modules/Platform/SunOS-PathScale-C.cmake

+include(Platform/SunOS-PathScale)
+__sunos_compiler_pathscale(C)

Modules/Platform/SunOS-PathScale-CXX.cmake

+include(Platform/SunOS-PathScale)
+__sunos_compiler_pathscale(CXX)

Modules/Platform/SunOS-PathScale-Fortran.cmake

+include(Platform/SunOS-PathScale)
+__sunos_compiler_pathscale(Fortran)

Modules/Platform/SunOS-PathScale.cmake

+
+#=============================================================================
+# Copyright 2016 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+# This module is shared by multiple languages; use include blocker.
+if(__SUNOS_COMPILER_PATHSCALE)
+  return()
+endif()
+set(__SUNOS_COMPILER_PATHSCALE 1)
+
+macro(__sunos_compiler_pathscale lang)
+  # Shared library compile and link flags.
+  set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
+  set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
+  set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
+
+  set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG "-Wl,-R")
+  set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG_SEP ":")
+  set(CMAKE_SHARED_LIBRARY_SONAME_${lang}_FLAG "-Wl,-h")
+endmacro()