lib: Support gcc-4.6.4: Add mmap, munmap.
* include/linux/x86/syscall.h (SYS_mmap, SYS_munmap): New defines.
* include/linux/x86_64/syscall.h (SYS_mmap, SYS_munmap): New defines.
* include/linux/arm/syscall (SYS_mmap, SYS_munmap): New defines..
* include/sys/mman.h (MAP_SHARED, MAP_PRIVATE, MAP_ANONYMOUS,
MAP_POPULATE, MAP_ANON, MAP_FAILED): New macro.
(mmap, munmap): Declare.
* lib/linux/x86-mes-gcc/mes.c (_sys_call6): New function.
* lib/linux/x86-mes/mes.c (__sys_call6): New function.
(_sys_call6): New function.
* lib/linux/x86_64-mes-gcc/mes.c (_sys_call6): New function.
* lib/linux/x86_64-mes/mes.c (__sys_call): Cater for 6 syscall parameters.
(_sys_call6): New function.
* lib/x86-mes/x86.M1 (pop____%ebp): New macro.
* lib/x86_64-mes/x86_64.M1 (mov____0x8(%rbp),%r9): New macro.
* lib/linux/arm-mes-gcc/syscall.c (_sys_call6, __sys_call6): Enable.
* lib/linux/mmap.c: New file.
* lib/linux/munmap.c: New file.
* build-aux/configure-lib.sh (libc_gnu_SOURCES): Add them.
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