* configure.in: Create compatibility code in bits/libc-lock.h file.
* libio.h (_IO_LOCK_T): Handle glibc 2 when _IO_MTSAFE_IO is
not defined.
* filedoalloc.c (_IO_file_doallocate): Don't call
_IO_cleanup_registration_needed if __linux__ is defined.
* iofclose.c (fclose): Make it weak alias of _IO_fclose if
__ELF__ is defined.
* iovsprintf.c (vsprintf): Make it weak alias of _IO_vsprintf
if __ELF__ is defined.
* iovsscanf.c (vsscanf): Make it weak alias of _IO_vsscanf if
__ELF__ is defined.
* config/linuxlibc1.mt (MT_CFLAGS): Defined as -D_G_HAVE_MMAP.
(IO_OBJECTS): Add filedoalloc.o fileops.o genops.o iofclose.o
iovsprintf.o iovsscanf.o strops.o.
From-SVN: r15931
