* Add generic platform support for Linux/m68k
* Include sem_t when determining values for FB_ALIGNMENT and FB_DOUBLE_ALIGN
On m68k, 'long long' is 16-bit aligned while 'sem_t' is 32-bit aligned
and we must therefore include 'sem_t' when determining the values for
FB_ALIGNMENT and FB_DOUBLE_ALIGN. Otherwise, the futex system call
will fail on these systems.
* Don't try to include headers for __cpuid on non-x86 targets
* Make sure that the version scripts include _IO_stdin_used on Linux
The GNU C library supports two ABIs for libio, one is the pre-2.1
ABI and the other is the current one. In order to determine which
ABI is to be used, the C library checks whether the _IO_stdin_used
symbol is exported by the executable. In case the symbol is present,
the new ABI is assumed, if the symbol is missing, the old ABI is
assumed. Thus, if an application is linked against a modern version
of glibc, it must export the _IO_stdin_used symbol as otherwise the
executable can crash or provoke other unexpected behavior on some
architectures like PowerPC or MIPS because the C library is using
the old ABI in this case.
