Adds the (somewhat silly) _CS_V[67]_ENV and _CS_POSIX_V[67]_* defines

to <unistd.h> and confstr(3) per POSIX 1003.1-2008
Change confstr(_CS_PATH) to operate directly instead of calling sysctl(3)
ports build tested by espie@

src/include/unistd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: unistd.h,v 1.74 2012/12/05 23:19:57 deraadt Exp $ */
+/*	$OpenBSD: unistd.h,v 1.75 2013/03/01 21:19:41 guenther Exp $ */
 /*	$NetBSD: unistd.h,v 1.26.4.1 1996/05/28 02:31:51 mrg Exp $	*/
 
 /*-
@@ -282,7 +282,38 @@
 #define	_SC_NPROCESSORS_ONLN	503
 
 /* configurable system strings */
-#define	_CS_PATH		 1
+#define	_CS_PATH				 1
+#define	_CS_POSIX_V6_ILP32_OFF32_CFLAGS		 2
+#define	_CS_POSIX_V6_ILP32_OFF32_LDFLAGS	 3
+#define	_CS_POSIX_V6_ILP32_OFF32_LIBS		 4
+#define	_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS	 5
+#define	_CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS	 6
+#define	_CS_POSIX_V6_ILP32_OFFBIG_LIBS		 7
+#define	_CS_POSIX_V6_LP64_OFF64_CFLAGS		 8
+#define	_CS_POSIX_V6_LP64_OFF64_LDFLAGS		 9
+#define	_CS_POSIX_V6_LP64_OFF64_LIBS		10
+#define	_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS	11
+#define	_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS	12
+#define	_CS_POSIX_V6_LPBIG_OFFBIG_LIBS		13
+#define	_CS_POSIX_V6_WIDTH_RESTRICTED_ENVS	14
+#define	_CS_V6_ENV				15
+#define	_CS_POSIX_V7_ILP32_OFF32_CFLAGS		16
+#define	_CS_POSIX_V7_ILP32_OFF32_LDFLAGS	17
+#define	_CS_POSIX_V7_ILP32_OFF32_LIBS		18
+#define	_CS_POSIX_V7_ILP32_OFFBIG_CFLAGS	19
+#define	_CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS	20
+#define	_CS_POSIX_V7_ILP32_OFFBIG_LIBS		21
+#define	_CS_POSIX_V7_LP64_OFF64_CFLAGS		22
+#define	_CS_POSIX_V7_LP64_OFF64_LDFLAGS		23
+#define	_CS_POSIX_V7_LP64_OFF64_LIBS		24
+#define	_CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS	25
+#define	_CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS	26
+#define	_CS_POSIX_V7_LPBIG_OFFBIG_LIBS		27
+#define	_CS_POSIX_V7_THREADS_CFLAGS		28
+#define	_CS_POSIX_V7_THREADS_LDFLAGS		29
+#define	_CS_POSIX_V7_WIDTH_RESTRICTED_ENVS	30
+#define	_CS_V7_ENV				31
+
 
 #ifndef NULL
 #ifdef 	__GNUG__