[CMake] Support building shared library for NetBSD

(cherry picked from commit 51c5d74940c3a6682ccd44491cb40c7e26fb83e5)

Author: brad0

llvm/tools/llvm-shlib/CMakeLists.txt

@@ -33,12 +33,14 @@ if(LLVM_BUILD_LLVM_DYLIB)
   add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB SONAME ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})
 
   list(REMOVE_DUPLICATES LIB_NAMES)
-  if(("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") OR (MINGW) OR (HAIKU)
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "FreeBSD")
+  if((MINGW) OR (HAIKU)
+     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "GNU")
+     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "FreeBSD")
+     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "NetBSD")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "OpenBSD")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Fuchsia")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "DragonFly")
+     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Fuchsia")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Android")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")) # FIXME: It should be "GNU ld for elf"
     configure_file(