fixes & cleanups

- tccgen.c/tcc.h: allow function declaration after use:
      int f() { return g(); }
      int g() { return 1; }
  may be a warning but not an error
  see also 76cb1144ef

- tccgen.c: redundant code related to inline functions removed
  (functions used anywhere have sym->c set automatically)

- tccgen.c: make 32bit llop non-equal test portable
  (probably not on C67)

- dynarray_add: change prototype to possibly avoid aliasing
  problems or at least warnings

- lib/alloca*.S: ".section .note.GNU-stack,"",%progbits" removed
  (has no effect)

- tccpe: set SizeOfCode field (for correct upx decompression)

- libtcc.c: fixed alternative -run invocation
      tcc "-run -lxxx ..." file.c
  (meant to load the library after file).
  Also supported now:
      tcc files ... options ... -run @ arguments ...

tcc.h

@@ -388,7 +388,7 @@ struct Attribute {
         func_export   : 1,
         func_import   : 1,
         func_args     : 5,
-        func_proto    : 1,
+        func_body     : 1,
         mode          : 4,
         weak          : 1,
         visibility    : 2,
@@ -1096,7 +1096,7 @@ PUB_FUNC NORETURN void tcc_error(const char *fmt, ...);
 PUB_FUNC void tcc_warning(const char *fmt, ...);
 
 /* other utilities */
-ST_FUNC void dynarray_add(void ***ptab, int *nb_ptr, void *data);
+ST_FUNC void dynarray_add(void *ptab, int *nb_ptr, void *data);
 ST_FUNC void dynarray_reset(void *pp, int *n);
 ST_INLN void cstr_ccat(CString *cstr, int ch);
 ST_FUNC void cstr_cat(CString *cstr, const char *str, int len);
@@ -1486,7 +1486,6 @@ static inline void add64le(unsigned char *p, int64_t x) {
 /* ------------ i386-gen.c ------------ */
 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
 ST_FUNC void g(int c);
-ST_FUNC int oad(int c, int s);
 ST_FUNC void gen_le16(int c);
 ST_FUNC void gen_le32(int c);
 ST_FUNC void gen_addr32(int r, Sym *sym, long c);
@@ -1510,7 +1509,6 @@ ST_FUNC void gen_opl(int op);
 ST_FUNC char *default_elfinterp(struct TCCState *s);
 #endif
 ST_FUNC void arm_init(struct TCCState *s);
-ST_FUNC uint32_t encbranch(int pos, int addr, int fail);
 ST_FUNC void gen_cvt_itof1(int t);
 #endif