powerpc max-page-size vs __QNXTARGET__

powerpc max-page-size vs __QNXTARGET__

The default max-page-size on ppc32 has been 64k since 1995-02-15 (git
commit bcbe2c71).  There was a change committed 2003-07-12 to chose a
4k page if __QNXTARGET__ is defined, but that particular commit was
from an earlier posted patch
https://sourceware.org/ml/binutils/2003-07/msg00211.html that only
made the change effective for arm, rather than the later one
https://sourceware.org/ml/binutils/2003-07/msg00220.html that also
changed powerpc and sh..

Since the __QNXTARGET__ #ifdef in elf32-ppc.c is ineffective unless
the user defines it in his or her CFLAGS, I'm removing that code.

	* elf32-ppc.c (ELF_MAXPAGESIZE, ELF_COMMONPAGESIZE): Don't depend
	on __QNXTARGET__ define.