Do not pass -allow-shlib-undefined to the Solaris linker.

Patch by Xan López.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240308 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -530,7 +530,7 @@ endif()
 # check its symbols. This is wasteful (the check was done when foo.so
 # was created) and can fail since it is not the dynamic linker and
 # doesn't know how to handle search paths correctly.
-if (UNIX AND NOT APPLE)
+if (UNIX AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
   set(CMAKE_EXE_LINKER_FLAGS
       "${CMAKE_EXE_LINKER_FLAGS} -Wl,-allow-shlib-undefined")
 endif()