tcctools.c: integrate tiny_libmaker/_impdef

usage:
    tcc -ar [rcsv] lib files...
    tcc -impdef lib.dll [-v] [-o lib.def]

also:
- support more files with -c: tcc -c f1.c f2.c ...
- fix a bug which caused tcc f1.c f2.S to produce no asm
- allow tcc -ar @listfile too
- change prototype: _void_ tcc_set_options(...)
- apply -Wl,-whole-archive when a librariy is given
  as libxxx.a also (not just for -lxxx)

tccasm.c

@@ -1005,6 +1005,7 @@ ST_FUNC int tcc_assemble(TCCState *s1, int do_preprocess)
     /* default section is text */
     cur_text_section = text_section;
     ind = cur_text_section->data_offset;
+    nocode_wanted = 0;
 
     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
        symbols can be safely used */