$NetBSD: patch-Makefile.common,v 1.1 2020/05/30 16:19:44 nia Exp $

Don't vendor zlib.

--- Makefile.common.orig	2020-05-08 13:51:31.000000000 +0000
+++ Makefile.common
@@ -8,8 +8,7 @@ INCFLAGS := \
 	-I$(CORE_DIR)/libretro  \
 	-I$(GUI) \
 	-I$(GUI)/nuklear \
-	-I$(GUI)/retro \
-   -I$(DEPS)/zlib
+	-I$(GUI)/retro
 
 SOURCES_C := \
 				 $(CORE_DIR)/libretro/libretro-core.c \
@@ -33,17 +32,3 @@ SOURCES_C += $(CORE_DIR)/libretro/retro_
 SOURCES_C += $(CORE_DIR)/libretro/retro_disk_control.c
 SOURCES_C += $(CORE_DIR)/libretro/retro_events.c
 SOURCES_C += $(CORE_DIR)/libretro/retro_snd.c
-
-SOURCES_C += \
-      $(DEPS)/zlib/adler32.c \
-      $(DEPS)/zlib/inflate.c \
-      $(DEPS)/zlib/inffast.c \
-      $(DEPS)/zlib/inftrees.c \
-      $(DEPS)/zlib/zutil.c \
-      $(DEPS)/zlib/gzread.c \
-      $(DEPS)/zlib/gzwrite.c \
-      $(DEPS)/zlib/gzclose.c \
-      $(DEPS)/zlib/gzlib.c \
-      $(DEPS)/zlib/trees.c \
-      $(DEPS)/zlib/crc32.c \
-      $(DEPS)/zlib/deflate.c