* configure.host: Add support for powerpc-eabialtivec*.
* libc/include/malloc.h: Add include of <machine/malloc.h>.
* libc/include/stdlib.h: Add include of <machine/stdlib.h>.
* libc/include/machine/malloc.h: New file.
* libc/include/machine/stdlib.h: Ditto.
* libc/include/machine/setjmp.h: Add support for powerpc altivec.
* libc/machine/powerpc/Makefile.am: Add conditional objects and
sources based on configuration.
* libc/machine/powerpc/Makefile.in: Regenerated.
* libc/machine/powerpc/configure: Ditto.
* libc/machine/powerpc/configure.in: Add check for
powerpc-eabialtivec* in which case add in additional source files.
* libc/machine/powerpc/setjmp.S: Add altivec support.
* libc/machine/powerpc/vec_calloc.c: New file.
* libc/machine/powerpc/vec_free.c: Ditto.
* libc/machine/powerpc/vec_malloc.c: Ditto.
* libc/machine/powerpc/vec_mallocr.c: Ditto.
* libc/machine/powerpc/vec_realloc.c: Ditto.
* libc/machine/powerpc/machine/malloc.h: Ditto.
* libc/machine/powerpc/machine/stdlib.h: Ditto.
* libc/machine/powerpc/vfprintf.c: New file that is vfprintf.c
with added altivec format specifiers.
* libc/machine/powerpc/vfscanf.c: New file that is vfscanf.c with
added altivec format specifiers.
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