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_...

tests/tests2/96_nodata_wanted.expect

@@ -11,12 +11,15 @@
 96_nodata_wanted.c:25: warning: assignment makes integer from pointer without a cast
 96_nodata_wanted.c:25: warning: nonportable conversion from pointer to char/short
 
-[test_data_suppression]
-suppression off
-  static data: 8 - 8.0 - 8.0 - main - static string
-  static bitfields: 333 44 555555 6 7
-  data length is not 0
-  text length is not 0
-suppression on
-  data length is 0
-  text length is 0
+[test_data_suppression_off]
+data:
+  8 - 8.0 - 8.0 - main - static string
+  333 44 555555 6 7
+size of data/text:
+  non-zero/non-zero
+# 111/193
+
+[test_data_suppression_on]
+size of data/text:
+  zero/zero
+# 0/0