gnu: libpng: Upgrade to 1.5.17. * gnu/packages/libpng.scm (libpng): Upgrade to 1.5.17.
Merge branch 'master' into core-updates Conflicts: gnu/packages/make-bootstrap.scm
gnu: libpng: Propagate zlib. * gnu/packages/libpng.scm (libpng): Propagate zlib.
Merge branch 'master' into core-updates Conflicts: Makefile.am guix/scripts/gc.scm guix/scripts/package.scm guix/ui.scm tests/guix-package.sh
gnu: Update libpng to 1.5.14. * gnu/packages/libpng.scm (libpng): Switch to version 1.5.14.
gnu: Add libpng. * gnu/packages/libpng.scm: New file. * Makefile.am (MODULES): Add it.