fix line truncation error

Hi, this MR fixes the truncation error when using GCC compiler on Levante:

externals/mtime/src/mtime_t_juliandelta.inc:18:

          call handle_errno(1 * 100 + 1, __FILE__, __LINE__)

                                                               1
Error: Line truncated at (1) [-Werror=line-truncation

src/mtime_t_juliandelta.inc

@@ -19,7 +19,9 @@
     c_pointer = my_newjuliandelta(sign, day, ms)
     !print *,sign, c_pointer
     if (.not. c_associated(c_pointer)) then
-       call handle_errno(1 * 100 + 1, __FILE__, __LINE__)
+       call handle_errno(1 * 100 + 1, &
+         & __FILE__, &
+         & __LINE__)
        t_juliandelta_assign_raw%jd%sign = 'L'
     else
        call c_f_pointer(c_pointer, jd_tmp)