Remove unused import

Author: minhqdao

src/fpm_command_line.f90

@@ -29,7 +29,7 @@ module fpm_command_line
 use M_CLI2,           only : set_args, lget, sget, unnamed, remaining, specified
 use M_CLI2,           only : get_subcommand, CLI_RESPONSE_FILE
 use fpm_strings,      only : lower, split, to_fortran_name, is_fortran_name
-use fpm_filesystem,   only : basename, canon_path, which, run, join_path
+use fpm_filesystem,   only : basename, canon_path, which, run
 use fpm_environment,  only : get_command_arguments_quoted
 use fpm_error,        only : fpm_stop, error_t
 use fpm_os,           only : get_current_directory