[compiler-rt][cmake] Exclude emutls.c when COMPILER_RT_BAREMETAL_BUILD is set

[clm]

Summary

Add lib/builtins/emutls.c to the list of files that are excluded from baremetal builds.

[jroelofs]

LGTM

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

set(GENERIC_SOURCES
   udivdi3.c
   udivmoddi4.c
   udivmodsi4.c
   udivmodti4.c
   udivsi3.c
   udivti3.c
   umoddi3.c
   umodsi3.c
-  umodti3.c
-  emutls.c)
+  umodti3.c)
 
 set(GENERIC_TF_SOURCES
   comparetf2.c
   extenddftf2.c
   extendsftf2.c
   fixtfdi.c
   fixtfsi.c
   fixtfti.c

 
 option(COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN
   "Skip the atomic builtin (this may be needed if system headers are unavailable)"
   Off)
 
 if(NOT COMPILER_RT_BAREMETAL_BUILD)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
+    emutls.c 
     enable_execute_stack.c)
 endif()
 
 if(COMPILER_RT_HAS_ATOMIC_KEYWORD AND NOT COMPILER_RT_EXCLUDE_ATOMIC_BUILTIN)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
     atomic.c)
 endif()