$NetBSD: patch-CMakeLists.txt,v 1.1 2018/10/15 17:20:21 nia Exp $

Use png and curl from pkgsrc.

--- CMakeLists.txt.orig	2018-10-14 19:34:08.015071627 +0000
+++ CMakeLists.txt
@@ -613,7 +613,7 @@ else()
   set(LZO lzo2)
 endif()
 
-if(NOT APPLE AND NOT MSVC AND NOT LIBRETRO)
+if(NOT APPLE AND NOT MSVC)
   check_lib(PNG libpng png png.h QUIET)
 endif()
 if (PNG_FOUND)
@@ -687,7 +687,7 @@ else()
 endif()
 
 find_package(CURL)
-if(CURL_FOUND AND NOT(LIBRETRO))
+if(CURL_FOUND)
   message(STATUS "Using shared libcurl")
   include_directories(${CURL_INCLUDE_DIRS})
 else()