Make sure to always add a leading space to compile flags

Author: awvwgk

fpm/src/fpm_command_line.f90

@@ -471,15 +471,15 @@ subroutine check_build_vals()
             val_compiler='gfortran'
         endif
 
-        val_flag = sget('flag')
+        val_flag = " " // sget('flag')
         val_profile = sget('profile')
         if (val_flag == '') then
             call get_default_compile_flags(val_compiler, val_profile == "release", val_flag)
         else
             select case(val_profile)
             case("release", "debug")
                call get_default_compile_flags(val_compiler, val_profile == "release", flags)
-               val_flag = flags // " " // val_flag
+               val_flag = flags // val_flag
             end select
         end if
         allocate(character(len=16) :: val_build)