$NetBSD: patch-libpng-config.in,v 1.1 2021/05/18 10:05:18 jperkin Exp $

Make --libs behave the same as --ldflags and include all libs.

--- libpng-config.in.orig	2019-04-14 18:10:32.000000000 +0000
+++ libpng-config.in
@@ -19,7 +19,7 @@ includedir="@includedir@/libpng@PNGLIB_M
 libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
 all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
 I_opts="-I${includedir}"
-L_opts="-L${libdir}"
+L_opts="@COMPILER_RPATH_FLAG@${libdir} -L${libdir}"
 R_opts=""
 cppflags=""
 ccopts=""
@@ -88,7 +88,7 @@ while test $# -gt 0; do
         ;;
 
     --libs)
-        echo ${libs}
+        echo ${ldopts} ${L_opts} ${R_opts} ${all_libs}
         ;;
 
     --I_opts)
@@ -108,7 +108,7 @@ while test $# -gt 0; do
         ;;
 
     --ldflags)
-        echo ${ldopts} ${L_opts} ${R_opts} ${libs}
+        echo ${ldopts} ${L_opts} ${R_opts} ${all_libs}
         ;;
 
     --static)