ubsan: Stop building the DLL version of the runtime library on Windows.

[pcc]

Summary

As far as I know we never use it.

[rnk]

lgtm

compiler-rt/trunk/lib/ubsan/CMakeLists.txt

if(COMPILER_RT_HAS_UBSAN)
 
     add_compiler_rt_runtime(clang_rt.ubsan_standalone_cxx
       STATIC
       ARCHS ${UBSAN_SUPPORTED_ARCH}
       OBJECT_LIBS RTUbsan_cxx
       CFLAGS ${UBSAN_CXXFLAGS}
       PARENT_TARGET ubsan)
 
+    if (UNIX)
       add_compiler_rt_runtime(clang_rt.ubsan_standalone
         SHARED
         ARCHS ${UBSAN_SUPPORTED_ARCH}
         OBJECT_LIBS RTSanitizerCommon
                 RTSanitizerCommonLibc
                 RTUbsan
         CFLAGS ${UBSAN_CFLAGS}
         LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS}
         LINK_LIBS ${UBSAN_DYNAMIC_LIBS}
         PARENT_TARGET ubsan)
 
       add_compiler_rt_runtime(clang_rt.ubsan_standalone_cxx
         SHARED
         ARCHS ${UBSAN_SUPPORTED_ARCH}
         OBJECT_LIBS RTSanitizerCommon
                 RTSanitizerCommonLibc
                 RTUbsan
                 RTUbsan_cxx
         CFLAGS ${UBSAN_CXXFLAGS}
         LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS}
         LINK_LIBS ${UBSAN_DYNAMIC_LIBS}
         PARENT_TARGET ubsan)
 
-    if (UNIX)
       set(ARCHS_FOR_SYMBOLS ${UBSAN_SUPPORTED_ARCH})
       list(REMOVE_ITEM ARCHS_FOR_SYMBOLS i386)
       add_sanitizer_rt_symbols(clang_rt.ubsan_standalone
         ARCHS ${ARCHS_FOR_SYMBOLS}
         PARENT_TARGET ubsan
         EXTRA ubsan.syms.extra)
       add_sanitizer_rt_symbols(clang_rt.ubsan_standalone_cxx
         ARCHS ${ARCHS_FOR_SYMBOLS}
         PARENT_TARGET ubsan
         EXTRA ubsan.syms.extra)
     endif()
   endif()
 endif()