Upgrade libspng

But we’ll continue using libpng as it seems that libspng may not currently be faster at encoding randy408/libspng#224

Author: karlvr

lib/CMakeLists.txt

@@ -139,7 +139,6 @@ if (WITH_LIBSPNG)
         ExternalProject_Add(libspng
           URL "https://github.com/randy408/libspng/archive/v${SPNG_VERSION}.tar.gz"
           PREFIX "${CMAKE_CURRENT_BINARY_DIR}/libspng"
-          PATCH_COMMAND patch -p1 < ${CMAKE_CURRENT_SOURCE_DIR}/patches/libspng-0.6-fixes.patch
           CMAKE_ARGS
           -DCMAKE_INSTALL_PREFIX=${EXT_INSTALL_DIR}
           -DCMAKE_BUILD_TYPE=Release

lib/VERSIONS

@@ -11,7 +11,7 @@ JPG_VERSION=2.1.5.1
 PNG_VERSION=1.6.37
 
 # renovate: datasource=github-releases depName=libspng packageName=randy408/libspng
-SPNG_VERSION=0.6.0
+SPNG_VERSION=0.7.3
 
 # renovate: datasource=git-tags depName=giflib packageName=https://git.code.sf.net/p/giflib/code extractVersionTemplate=^(?<version>.*)$
 GIF_VERSION=5.2.1