Remove LIBPNG_LDFLAGS from config

Since version 3.70 upstream seized to use libpng in linking phase
as the whole png generation is now being done by ghostscript
itself.

The last file using libpng was psimage.cpp where the include is
dropped.

Fixes: #1415258

pstoedit.spec

@@ -1,6 +1,6 @@
 Name:           pstoedit
 Version:        3.70
-Release:        9%{?dist}
+Release:        10%{?dist}
 Summary:        Translates PostScript and PDF graphics into other vector formats
 
 Group:          Applications/Productivity
@@ -9,10 +9,10 @@ URL:            http://www.pstoedit.net/
 Source0:        http://downloads.sourceforge.net/pstoedit/pstoedit-%{version}.tar.gz
 
 Patch0:         pstoedit-pkglibdir.patch
+Patch1:					remove-libpng-ldflags.patch
 
 Requires:       ghostscript
 BuildRequires:  gd-devel
-BuildRequires:  libpng-devel
 BuildRequires:  dos2unix
 BuildRequires:  ghostscript
 BuildRequires:  plotutils-devel
@@ -31,7 +31,6 @@ drivers
 Summary:        Headers for developing programs that will use %{name}
 Group:          Development/Libraries
 Requires:       %{name} = %{version}-%{release}
-Requires:       libpng-devel
 
 %description devel
 This package contains the header files needed for developing %{name}
@@ -43,6 +42,7 @@ applications
 
 # correctly load plugins (#1247187)
 %patch0 -p1 -b .pkglibdir
+%patch1 -p1
 
 dos2unix doc/*.htm doc/readme.txt
 
@@ -89,6 +89,9 @@ find $RPM_BUILD_ROOT -type f -name "*.la" -exec rm -f {} ';'
 
 
 %changelog
+* Fri Apr 13 2018 Sebastian Kisela <skisela@redhat.com> - 3.70-10
+- Drop unused libpng dependency
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 3.70-9
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 

remove-libpng-ldflags.patch

@@ -0,0 +1,28 @@
+From 421cdbeccccb68589002b24dc6e91b23ccd86bfd Mon Sep 17 00:00:00 2001
+From: Sebastian Kisela <skisela@redhat.com>
+Date: Fri, 13 Apr 2018 09:25:37 +0200
+Subject: [PATCH] Remove LIBPNG_LDFLAGS from config
+
+From version 3.70 upstream seized to use libpng in linking phase
+as the whole png generation is now being done by ghostscript
+itself.
+
+Fixes: #1415258
+---
+ config/pstoedit.pc.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/config/pstoedit.pc.in b/config/pstoedit.pc.in
+index 3131ac5..ffda220 100644
+--- a/config/pstoedit.pc.in
++++ b/config/pstoedit.pc.in
+@@ -7,5 +7,5 @@ Name: pstoedit
+ Description: converts PostScript(TM) and PDF files to other vector graphic formats
+ Version: @VERSION@.0
+ Requires: 
+-Libs: -L@libdir@ -lpstoedit @LIBPNG_LDFLAGS@ @CXX_STD_LIB@ @CXX_RUNTIME_LIB@ @LIBLD_LDFLAGS@
++Libs: -L@libdir@ -lpstoedit @CXX_STD_LIB@ @CXX_RUNTIME_LIB@ @LIBLD_LDFLAGS@
+ Cflags: -I@includedir@
+-- 
+2.14.3
+