Use qt's own internal png, jpeg and tiff implementations

qt/build.sh

@@ -5,8 +5,8 @@ chmod +x configure
 echo yes | ./configure -prefix $PREFIX \
 		       -shared -release -thread \
 		       -system-zlib \
-		       -system-libjpeg \
-		       -system-libpng \
+		       -qt-libjpeg \
+		       -qt-libpng \
 		       -qt-gif \
 		       -L $PREFIX/lib \
 		       -I $PREFIX/include

qt/meta.yaml

@@ -18,18 +18,12 @@ requirements:
     - freetype 2.4.*
     - freeglut 2.8.*
     - openssl 1.0.2*
-    - libpng 1.5.*
-    - jpeg 8*
-    - libtiff 4.0.*
   run:
     - libgcc
     - zlib 1.2.*
     - freetype 2.4.*
     - freeglut 2.8.*
     - openssl 1.0.2*
-    - libpng 1.5.*
-    - jpeg 8*
-    - libtiff 4.0.*
 
 test:
   commands: