cmake: fix missing spacing in log message

Follow-up to e89491e curl#15337
Closes curl#15411

Author: vszakats

CMake/PickyWarnings.cmake

@@ -254,5 +254,5 @@ endif()
 if(_picky)
   string(REPLACE ";" " " _picky "${_picky}")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_picky}")
-  message(STATUS "Picky compiler options:${_picky}")
+  message(STATUS "Picky compiler options: ${_picky}")
 endif()