configure: cleanup

- add quotes: eval opt=\"$opt\"
- use $source_path/conftest.c for OOT build
- add fn_makelink() for OOT build
- do not check lddir etc. on Windows/MSYS
- formatting

config-print.c
- rename to conftest.c (for consistency)
- change option e to b
- change output from that from "yes" to "no"
- remove inttypes.h dependency
- simpify version output

Makefile:
- improve GCC warning flag checks

tcc.h:
- add back default CONFIG_LDDIR
- add default CONFIG_TCCDIR also (just for fun)

tccpp.c:
- fix Christian's last warning
  tccpp.c: In function ‘macro_subst’:
  tccpp.c:2803:12: warning: ‘*((void *)&cval+4)’ is used uninitialized
     in this function [-Wuninitialized]
  That the change fixes the warning doesn't make sense but anyway.

libtcc.c:
- tcc_error/warning: print correct source filename/line for
  token :paste: (also inline :asm:)

lddir and multiarch logic still needs fixing.

tccpp.c

@@ -2800,13 +2800,13 @@ static inline int *macro_twosharps(const int *macro_str)
 {
     const int *ptr;
     int t;
-    CValue cval;
     TokenString macro_str1;
     CString cstr;
     int n, start_of_nosubsts;
 
     /* we search the first '##' */
     for(ptr = macro_str;;) {
+        CValue cval;
         TOK_GET(&t, &ptr, &cval);
         if (t == TOK_TWOSHARPS)
             break;
@@ -2835,10 +2835,9 @@ static inline int *macro_twosharps(const int *macro_str)
             /* given 'a##b', remove nosubsts preceding 'b' */
             while (t == TOK_NOSUBST)
                 t = *++ptr;
-            
             if (t && t != TOK_TWOSHARPS) {
+                CValue cval;
                 TOK_GET(&t, &ptr, &cval);
-
                 /* We concatenate the two tokens */
                 cstr_new(&cstr);
                 cstr_cat(&cstr, get_tok_str(tok, &tokc));
@@ -2846,7 +2845,7 @@ static inline int *macro_twosharps(const int *macro_str)
                 cstr_cat(&cstr, get_tok_str(t, &cval));
                 cstr_ccat(&cstr, '\0');
 
-                tcc_open_bf(tcc_state, "<paste>", cstr.size);
+                tcc_open_bf(tcc_state, ":paste:", cstr.size);
                 memcpy(file->buffer, cstr.data, cstr.size);
                 for (;;) {
                     next_nomacro1();