[lldb] Silence CMake warnings about missing FindFBSDVMCore

[mgorny]

Summary

Pass QUIET to find_package() in order to quiet the warning about missing
FindFBSDVMCore.cmake. FBSDVMCore always provides native CMake config
files, therefore providing a fallback module serves no purpose.

lldb/cmake/modules/LLDBConfig.cmake

 set(LLDB_LINKER_SUPPORTS_GROUPS OFF)
 if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT "${CMAKE_SYSTEM_NAME}" MATCHES "Darwin")
   # The Darwin linker doesn't understand --start-group/--end-group.
   set(LLDB_LINKER_SUPPORTS_GROUPS ON)
 endif()
 
 macro(add_optional_dependency variable description package found)
   cmake_parse_arguments(ARG
-    ""
+    "QUIET"
     "VERSION"
     ""
     ${ARGN})
 
   set(${variable} "Auto" CACHE STRING "${description} On, Off or Auto (default)")
   string(TOUPPER "${${variable}}" ${variable})
 
   if("${${variable}}" STREQUAL "AUTO")
     set(find_package TRUE)
     set(maybe_required)
   elseif(${${variable}})
     set(find_package TRUE)
     set(maybe_required REQUIRED)
   else()
     set(find_package FALSE)
     set(${variable} FALSE)
   endif()
 
   if(${find_package})
-    find_package(${package} ${ARG_VERSION} ${maybe_required})
+    set(maybe_quiet)
+    if(ARG_QUIET)
+      set(maybe_quiet QUIET)
+    endif()
+    find_package(${package} ${ARG_VERSION} ${maybe_required} ${maybe_quiet})
     set(${variable} "${${found}}")
   endif()
 
   message(STATUS "${description}: ${${variable}}")
 endmacro()
 
 add_optional_dependency(LLDB_ENABLE_LIBEDIT "Enable editline support in LLDB" LibEdit LibEdit_FOUND)
 add_optional_dependency(LLDB_ENABLE_CURSES "Enable curses support in LLDB" CursesAndPanel CURSESANDPANEL_FOUND)
 add_optional_dependency(LLDB_ENABLE_LZMA "Enable LZMA compression support in LLDB" LibLZMA LIBLZMA_FOUND)
 add_optional_dependency(LLDB_ENABLE_LUA "Enable Lua scripting support in LLDB" LuaAndSwig LUAANDSWIG_FOUND)
 add_optional_dependency(LLDB_ENABLE_PYTHON "Enable Python scripting support in LLDB" PythonAndSwig PYTHONANDSWIG_FOUND)
 add_optional_dependency(LLDB_ENABLE_LIBXML2 "Enable Libxml 2 support in LLDB" LibXml2 LIBXML2_FOUND VERSION 2.8)
-add_optional_dependency(LLDB_ENABLE_FBSDVMCORE "Enable libfbsdvmcore support in LLDB" FBSDVMCore FBSDVMCore_FOUND)
+add_optional_dependency(LLDB_ENABLE_FBSDVMCORE "Enable libfbsdvmcore support in LLDB" FBSDVMCore FBSDVMCore_FOUND QUIET)
 
 option(LLDB_USE_SYSTEM_SIX "Use six.py shipped with system and do not install a copy of it" OFF)
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)
 option(LLDB_BUILD_FRAMEWORK "Build LLDB.framework (Darwin only)" OFF)
 option(LLDB_NO_INSTALL_DEFAULT_RPATH "Disable default RPATH settings in binaries" OFF)
 option(LLDB_USE_SYSTEM_DEBUGSERVER "Use the system's debugserver for testing (Darwin only)." OFF)
 option(LLDB_SKIP_STRIP "Whether to skip stripping of binaries when installing lldb." OFF)
 option(LLDB_SKIP_DSYM "Whether to skip generating a dSYM when installing lldb." OFF)