'long' review

add some features for more complete 'long' support

tcc.h:
- use LONG_SIZE=4/8 instead of TCC_LONG_ARE_64_BIT
tccgen.c:
- add ptrdiff_type, update size_type
- support shift and ?: operations
- support long enum types
- display 'long' from type_to_str
- nwchar_t is unsigned short on windows
- unrelated: use memcpy in init_putv for long doubles to avoid
  random bytes in the image (if tcc was compiled by gcc) for
  diff purposes.
tccpp.c:
- make parse_number return correct types
- improve multi-character-constants 'XX' 'abcd'
Changelog:
- update

win32/build-tcc.bat

@@ -113,7 +113,7 @@ for %%f in (*tcc.exe *tcc.dll) do @del %%f
 :compiler
 %CC% -o libtcc.dll -shared ..\libtcc.c %D% -DLIBTCC_AS_DLL
 @if errorlevel 1 goto :the_end
-%CC% -o tcc.exe ..\tcc.c libtcc.dll %D% -DONE_SOURCE=0
+%CC% -o tcc.exe ..\tcc.c libtcc.dll %D% -DONE_SOURCE"=0"
 %CC% -o %PX%-tcc.exe ..\tcc.c %DX%
 
 @if (%TCC_FILES%)==(no) goto :files-done