enable long long and long double support in printf/scanf

[Artem B. Bityuckiy]

Hello.

Here is the patch that:

1. Adds --enable-newlib-io-long-long and --enable-newlib-io-long-double 
configure script options to allow users to enable long long and long 
double types support in printf/scanf series functions.
2. Removes direct passing -DWANT_PRINTF_LONG_LONG and -DWANT_IO_LONG_DBL 
command line arguments when compiling Newlib (see configure.host).
3. Adds new _WANT_IO_LONG_LONG and _WANT_IO_LONG_DOUBLE macros to newlib.hin
4. Uses new _WANT_IO_LONG_LONG and _WANT_IO_LONG_DOUBLE macros from 
newlib.h instead of old WANT_PRINTF_LONG_LONG and WANT_IO_LONG_DBL macros.

Also, there are 2 small changes:
1. Include <reent.h> in powerpc's printf/scanf
2. Remove junk newlib_cflags=${newlib_cflags} from configure.host

Note: aclocal.m4 and configure form newlib/ directory should be regenerated.

Please, see and commit if consider necessary.

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.
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