[CMake Linux] Only include pthread and rt in target_link_libraries for ld.gold support (Alchemy sync)

Fixes CMake warnings on Linux

indra/cmake/LLCommon.cmake

@@ -10,7 +10,6 @@ if (DARWIN)
   find_library(CORESERVICES_LIBRARY CoreServices)
 endif (DARWIN)
 
-
 set(LLCOMMON_INCLUDE_DIRS
     ${LIBS_OPEN_DIR}/cwdebug
     ${LIBS_OPEN_DIR}/llcommon
@@ -19,14 +18,7 @@ set(LLCOMMON_INCLUDE_DIRS
     ${Boost_INCLUDE_DIRS}
     )
 
-if (LINUX)
-    # In order to support using ld.gold on linux, we need to explicitely
-    # specify all libraries that llcommon uses.
-    # llcommon uses `clock_gettime' which is provided by librt on linux.
-    set(LLCOMMON_LIBRARIES llcommon rt)
-else (LINUX)
-    set(LLCOMMON_LIBRARIES llcommon)
-endif (LINUX)
+set(LLCOMMON_LIBRARIES llcommon)
 
 set(LLCOMMON_LINK_SHARED OFF CACHE BOOL "Build the llcommon target as a shared library.")
 if(LLCOMMON_LINK_SHARED)

indra/cmake/LLPlugin.cmake

@@ -5,10 +5,4 @@ set(LLPLUGIN_INCLUDE_DIRS
     ${LIBS_OPEN_DIR}/llplugin
     )
 
-if (LINUX)
-    # In order to support using ld.gold on linux, we need to explicitely
-    # specify all libraries that llplugin uses.
-    set(LLPLUGIN_LIBRARIES llplugin pthread)
-else (LINUX)
-    set(LLPLUGIN_LIBRARIES llplugin)
-endif (LINUX)
+set(LLPLUGIN_LIBRARIES llplugin)