libm: Fill in more dummy long double transcendental functions.

This should cover everything from C99.

lib/libm/src/ldbl_dummy.c

@@ -1,4 +1,4 @@
-/* $NetBSD: ldbl_dummy.c,v 1.2 2014/11/13 21:43:27 christos Exp $ */
+/* $NetBSD: ldbl_dummy.c,v 1.3 2023/03/13 18:18:36 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: ldbl_dummy.c,v 1.2 2014/11/13 21:43:27 christos Exp $");
+__RCSID("$NetBSD: ldbl_dummy.c,v 1.3 2023/03/13 18:18:36 riastradh Exp $");
 
 #include "namespace.h"
 #include <math.h>
@@ -43,8 +43,11 @@ __weak_alias(atan2l, _atan2l)
 __weak_alias(hypotl, _hypotl)
 __weak_alias(logl, _logl)
 __weak_alias(log10l, _log10l)
+__weak_alias(log2l, _log2l)
+__weak_alias(log1pl, _log1pl)
 __weak_alias(expl, _expl)
 __weak_alias(exp2l, _exp2l)
+__weak_alias(expm1l, _expm1l)
 __weak_alias(powl, _powl)
 __weak_alias(cosl, _cosl)
 __weak_alias(sinl, _sinl)
@@ -60,6 +63,8 @@ __weak_alias(asinhl, _asinhl)
 __weak_alias(atanhl, _atanhl)
 __weak_alias(erfl, _erfl)
 __weak_alias(erfcl, _erfcl)
+__weak_alias(lgammal, _lgammal)
+__weak_alias(tgammal, _tgammal)
 
 long double
 atan2l(long double y, long double x)
@@ -85,6 +90,18 @@ log10l(long double x)
 	return log10(x);
 }
 
+long double
+log2l(long double x)
+{
+	return log2(x);
+}
+
+long double
+log1pl(long double x)
+{
+	return log1p(x);
+}
+
 long double
 expl(long double x)
 {
@@ -97,6 +114,12 @@ exp2l(long double x)
 	return exp2(x);
 }
 
+long double
+expm1l(long double x)
+{
+	return expm1(x);
+}
+
 long double
 powl(long double x, long double y)
 {
@@ -187,3 +210,15 @@ erfcl(long double x)
 {
 	return erfc(x);
 }
+
+long double
+lgammal(long double x)
+{
+	return lgamma(x);
+}
+
+long double
+tgammal(long double x)
+{
+	return tgamma(x);
+}