File don-t-mark-libpng-as-required-library.patch of Package freetype2

Index: freetype-2.12.1/builds/unix/configure
===================================================================
--- freetype-2.12.1.orig/builds/unix/configure
+++ freetype-2.12.1/builds/unix/configure
@@ -16368,7 +16368,6 @@ fi
 # entries in Requires.private are separated by commas
 PKGCONFIG_REQUIRES_PRIVATE="$zlib_reqpriv,     \
                             $bzip2_reqpriv,    \
-                            $libpng_reqpriv,   \
                             $harfbuzz_reqpriv, \
                             $brotli_reqpriv"
 # beautify
@@ -16396,7 +16395,6 @@ PKGCONFIG_LIBS_PRIVATE=`echo "$PKGCONFIG
 LIBSSTATIC_CONFIG="-lfreetype               \
                    $zlib_libsstaticconf     \
                    $bzip2_libsstaticconf    \
-                   $libpng_libsstaticconf   \
                    $harfbuzz_libsstaticconf \
                    $brotli_libsstaticconf   \
                    $ft2_extra_libs"
Index: freetype-2.12.1/builds/unix/configure.raw
===================================================================
--- freetype-2.12.1.orig/builds/unix/configure.raw
+++ freetype-2.12.1/builds/unix/configure.raw
@@ -999,7 +999,6 @@ fi
 # entries in Requires.private are separated by commas
 PKGCONFIG_REQUIRES_PRIVATE="$zlib_reqpriv,     \
                             $bzip2_reqpriv,    \
-                            $libpng_reqpriv,   \
                             $harfbuzz_reqpriv, \
                             $brotli_reqpriv"
 # beautify
@@ -1027,7 +1026,6 @@ PKGCONFIG_LIBS_PRIVATE=`echo "$PKGCONFIG
 LIBSSTATIC_CONFIG="-lfreetype               \
                    $zlib_libsstaticconf     \
                    $bzip2_libsstaticconf    \
-                   $libpng_libsstaticconf   \
                    $harfbuzz_libsstaticconf \
                    $brotli_libsstaticconf   \
                    $ft2_extra_libs"