Update libpng from 1.6.43 to 1.6.44 (#1325)

* Update libpng from 1.6.43 to 1.6.44

* Add alternate url

* Update build instructions

---------

Co-authored-by: emscripten-forge-bot <[email protected]>
Co-authored-by: Isabel Paredes <[email protected]>

recipes/recipes_emscripten/libpng/build.sh

@@ -1,11 +1,24 @@
+# FIXME: libz.so has the wrong magic bytes
+rm $PREFIX/lib/libz.so*
+
 # Get an updated config.sub and config.guess
 cp $BUILD_PREFIX/share/libtool/build-aux/config.* .
 
-export CFLAGS="$CFLAGS -I$PREFIX/include -L$PREFIX/lib"
-export CPPFLAGS="$CPPFLAGS -I$PREFIX/include"
+# atomics and bulk-memory are required for cairo
+export CFLAGS="-I$PREFIX/include -matomics -mbulk-memory"
+export CPPFLAGS="-I$PREFIX/include"
+export LDFLAGS="$LDFLAGS -L$PREFIX/lib"
+
+mkdir -p build
+cd build
 
-emconfigure ./configure --prefix=$PREFIX \
-            --with-zlib-prefix=$PREFIX
+emconfigure ../configure --prefix=$PREFIX \
+            --with-zlib-prefix=$PREFIX \
+            --disable-shared
+# NOTE: to enable shared, the -shared flag needs to be replaced with SIDE_MODULE
 
-emmake make -j${CPU_COUNT} ${VERBOSE_AT}
+emmake make -j${CPU_COUNT}
 emmake make install
+
+# Not packaging any shared libraries
+rm $PREFIX/lib/libpng*.la

recipes/recipes_emscripten/libpng/recipe.yaml

@@ -1,14 +1,14 @@
 context:
   name: libpng
-  version: 1.6.43
+  version: 1.6.44
 
 package:
   name: ${{ name }}
   version: ${{ version }}
 
 source:
-  url: http://download.sourceforge.net/libpng/libpng-${{ version }}.tar.gz
-  sha256: e804e465d4b109b5ad285a8fb71f0dd3f74f0068f91ce3cdfde618180c174925
+  url: http://downloads.sourceforge.net/project/${{ name }}/libpng16/${{ version }}/${{ name }}-${{ version }}.tar.gz
+  sha256: 8c25a7792099a0089fa1cc76c94260d0bb3f1ec52b93671b572f8bb61577b732
 
 build:
   number: 0
@@ -25,6 +25,7 @@ tests:
   - test -f ${PREFIX}/lib/libpng.a
   - test -f ${PREFIX}/include/png.h
   - libpng-config --version
+
 about:
   license: zlib-acknowledgement
   license_file: LICENSE
@@ -34,6 +35,8 @@ about:
     libpng is the official PNG reference library. It supports almost all PNG
     features, is extensible, and has been extensively tested for over 20 years.
   homepage: http://www.libpng.org/pub/png/libpng.html
+
 extra:
   recipe-maintainers:
   - martinRenou
+  - IsabelParedes