Libraries updates and cleanup

* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2

include/arch/Makefile

@@ -1,46 +1,5 @@
-#	$NetBSD: Makefile,v 1.40 2009/12/13 05:01:33 nakayama Exp $
-
-# For now, we install the machine and arch includes, and symlink 'machine'
-# to the location of the machine includes (usually).
-#
-# Eventually, we should install everything.
-
 .include <bsd.own.mk>
 
 SUBDIR=	${MACHINE}
-ARCHSUBDIR= ${MACHINE_CPU}
 
-.if ${ARCHSUBDIR} == "mips64"
-ARCHSUBDIR= mips
-.endif
-.if ${ARCHSUBDIR} == "powerpc64"
-ARCHSUBDIR= powerpc
-.endif
-
-.if ${MACHINE} != ${ARCHSUBDIR}
-.if exists(${ARCHSUBDIR})
-SUBDIR+= ${ARCHSUBDIR}
-.endif
-.endif
-.if ${MACHINE} == sparc
-SUBDIR+= sparc64
-.endif
-.if (${MACHINE} == hpcmips || ${MACHINE} == hpcsh)
-SUBDIR+= hpc
-.endif
-.if (${MACHINE} == sun2 || ${MACHINE} == sun3)
-SUBDIR+= sun68k
-.endif
-.if defined(XEN_BUILD)
-SUBDIR+= xen
-.endif
-
-
-INCSYMLINKS= ${MACHINE_ARCH} /usr/include/machine
-
-INCSYMLINKS+= machine/float.h /usr/include/float.h \
-       machine/stdarg.h /usr/include/stdarg.h
-
-
-.include <bsd.inc.mk>
 .include <bsd.subdir.mk>