[PATCH 2 of 5] Remove -system-lipng from qt configure line

[Wald Commits]

# HG changeset patch
# User Andre Heinecke <andre.heinecke at intevation.de>
# Date 1408717186 -7200
# Node ID 7ac5a366184dcdff926d966ce6ffea1072d58811
# Parent  9e2266aa1cbfd24172bcb84f68cdf21b4ac932df
Remove -system-lipng from qt configure line

    This was not used anyway as -qt-png was provided later in the line

diff -r 9e2266aa1cbf -r 7ac5a366184d INSTALL
--- a/INSTALL	Fri Aug 22 16:01:26 2014 +0200
+++ b/INSTALL	Fri Aug 22 16:19:46 2014 +0200
@@ -35,7 +35,7 @@
     -release  -nomake tests  -nomake examples  -confirm-license \
     -static -no-cups -no-nis -no-icu -no-fontconfig -qt-freetype \
     -no-directfb -no-opengl -no-kms -no-eglfs -no-egl -no-openssl -no-glib \
-    -system-libpng -qpa xcb -qt-xkbcommon -qt-xcb -no-nis -no-libjpeg -qt-libpng \
+    -qpa xcb -qt-xkbcommon -qt-xcb -no-nis -no-libjpeg -qt-libpng \
     -qt-zlib -no-gif && \
     nice make -j`nproc` && \
     make install