tccgen: nodata_wanted fix, default ONE_SOURCE, etc...

tccgen.c:
  doubles need to be aligned, on ARM.  The section_reserve()
  in init_putv does not do that.
-D ONE_SOURCE: is now the default and not longer needed. Also,
  tcc.h now sets the default native target.  These both make
  compiling tcc simple as "gcc tcc.c -o tcc -ldl" again.
arm-asm.c:
  enable pseudo asm also for inline asm
tests/tests2/Makefile:
  disable bitfield tests except on windows and x86_64
  and don't generate-always
tcc.c:
  fix a loop with -dt on errors
configure:
  print compiler version (as recognized)
tccpp.c:
  actually define symbols for tcc -dt
  clear static variables (needed for -dt or libtcc usage)
96_nodata_wanted.c:
  use __label__ instead of asm
lib/files:
  use native symbols (__i386__ etc.) instead of TCC_TARGET_...

lib/libtcc1.c

@@ -107,10 +107,10 @@ union float_long {
 };
 
 /* XXX: we don't support several builtin supports for now */
-#if !defined(TCC_TARGET_X86_64) && !defined(TCC_TARGET_ARM)
+#if !defined __x86_64__ && !defined __arm__
 
 /* XXX: use gcc/tcc intrinsic ? */
-#if defined(TCC_TARGET_I386)
+#if defined __i386__
 #define sub_ddmmss(sh, sl, ah, al, bh, bl) \
   __asm__ ("subl %5,%1\n\tsbbl %3,%0"					\
 	   : "=r" ((USItype) (sh)),					\
@@ -589,7 +589,7 @@ long long __fixdfdi (double a1)
     return s ? ret : -ret;
 }
 
-#ifndef TCC_TARGET_ARM
+#ifndef __arm__
 unsigned long long __fixunsxfdi (long double a1)
 {
     register union ldouble_long dl1;