Build Plugin/JITLoader/GDB on all platforms.

[brucem]

Summary

We currently link to this on all platforms, so don't need to re-include
it into the LLDB_USED_LIBS. Also don't need to special case building
it for every supported platform.

[labath]

lgtm

cmake/LLDBDependencies.cmake

set( LLDB_USED_LIBS
   lldbPluginExpressionParserClang
   )
 
 # Windows-only libraries
 if ( CMAKE_SYSTEM_NAME MATCHES "Windows" )
   list(APPEND LLDB_USED_LIBS
     lldbPluginProcessWindows
     lldbPluginProcessWinMiniDump
-    lldbPluginJITLoaderGDB
     Ws2_32
     Rpcrt4
     )
 endif ()
 
 # Linux-only libraries
 if ( CMAKE_SYSTEM_NAME MATCHES "Linux" )
   list(APPEND LLDB_USED_LIBS
     lldbPluginProcessLinux
     lldbPluginProcessPOSIX
     lldbPluginProcessElfCore
-    lldbPluginJITLoaderGDB
    )
 endif ()
 
 # FreeBSD-only libraries
 if ( CMAKE_SYSTEM_NAME MATCHES "FreeBSD" )
   list(APPEND LLDB_USED_LIBS
     lldbPluginProcessFreeBSD
     lldbPluginProcessPOSIX
     lldbPluginProcessElfCore
-    lldbPluginJITLoaderGDB
     )
 endif ()
 
 # Darwin-only libraries
 if ( CMAKE_SYSTEM_NAME MATCHES "Darwin" )
   set(LLDB_VERS_GENERATED_FILE ${LLDB_BINARY_DIR}/source/LLDB_vers.c)
   add_custom_command(OUTPUT ${LLDB_VERS_GENERATED_FILE}
     COMMAND ${LLDB_SOURCE_DIR}/scripts/generate-vers.pl

source/Plugins/JITLoader/CMakeLists.txt

-if (CMAKE_SYSTEM_NAME MATCHES "FreeBSD" OR CMAKE_SYSTEM_NAME MATCHES "Linux"
-    OR CMAKE_SYSTEM_NAME MATCHES "Windows" OR CMAKE_SYSTEM_NAME MATCHES "Darwin")
-  add_subdirectory(GDB)
-endif()