Fix built-in PNG library build with MSVC 9 and older

Upgrade the submodule to a version which doesn't try to use SSE2 with
this old compiler, as it doesn't support the required intrinsics.

See https://github.com/wxWidgets/libpng/pull/4
This commit is contained in:
Vadim Zeitlin 2020-04-24 00:42:41 +02:00
parent 4ee7202121
commit dc34600c0c

@ -1 +1 @@
Subproject commit 8cb5f8f1587b95a0e86fa8c2becea0cef8ee0a8b
Subproject commit f1ecc2c50d0976f3d8f0eaf805cbc399c0780d8b