Switch libc and libm to use strong aliases rather than weak aliases

where appropriate.  Among other things makes the symbols consistent
across all architectures (notably where ldbl mantissa is 53 bits).
While at it, kill unused LINTLIBRARY/PROTOLIB1 cruft which was there
to trick lint into recording the right prototypes for aliased
functions.  Most of the work done at the awesome n2k13 hackathon.
Agreed by kettenis@, guenther@, matthew@.

src/lib/libc/stdlib/strtoll.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: strtoll.c,v 1.6 2005/11/10 10:00:17 espie Exp $ */
+/* $OpenBSD: strtoll.c,v 1.7 2013/03/28 18:09:38 martynas Exp $ */
 /*-
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
@@ -141,13 +141,4 @@ strtoll(const char *nptr, char **endptr, int base)
 	return (acc);
 }
 
-#ifdef __weak_alias
-__weak_alias(strtoq, strtoll);
-#else
-quad_t
-strtoq(const char *nptr, char **endptr, int base)
-{
-
-        return ((quad_t)strtoll(nptr, endptr, base));
-}
-#endif
+__strong_alias(strtoq, strtoll);

src/lib/libc/stdlib/strtoull.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
+/*	$OpenBSD: strtoull.c,v 1.6 2013/03/28 18:09:38 martynas Exp $ */
 /*-
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
@@ -103,13 +103,4 @@ strtoull(const char *nptr, char **endptr, int base)
 	return (acc);
 }
 
-#ifdef __weak_alias
-__weak_alias(strtouq, strtoull);
-#else
-u_quad_t
-strtouq(const char *nptr, char **endptr, int base)
-{
-
-	return ((u_quad_t)strtoull(nptr, endptr, base));
-}
-#endif
+__strong_alias(strtouq, strtoull);