Fixes to get libc++ building on sun solaris. Patch from C Bergstrom.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@222794 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 318c4ce..12e9f4a 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -3,6 +3,9 @@
 if(WIN32)
   file(GLOB LIBCXX_WIN32_SOURCES ../src/support/win32/*.cpp)
   list(APPEND LIBCXX_SOURCES ${LIBCXX_WIN32_SOURCES})
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")
+  file(GLOB LIBCXX_SOLARIS_SOURCES ../src/support/solaris/*.c)
+  list(APPEND LIBCXX_SOURCES ${LIBCXX_SOLARIS_SOURCES})
 endif()
 
 # Add all the headers to the project for IDEs.