update libpng

update libpng, the repo now requires a vcpkg setup for integrating but skipping the install step should allow it to work for windows an linux, mac might need more

Engine/lib/lpng/scripts/makefile.aix

@@ -1,6 +1,6 @@
 # makefile for libpng using gcc (generic, static library)
+# Copyright (C) 2000, 2020-2025 Cosmin Truta
 # Copyright (C) 2002, 2006-2009, 2014 Glenn Randers-Pehrson
-# Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
@@ -15,84 +15,46 @@ ZLIBLIB = ../zlib
 # Compiler, linker, lib and other tools
 CC = gcc
 LD = $(CC)
-AR_RC = ar rcs
-MKDIR_P = mkdir -p
+AR = ar
 RANLIB = ranlib
 RM_F = rm -f
-LN_SF = ln -f -s
 
 LIBNAME = libpng16
 PNGMAJ = 16
 
-prefix=/usr/local
-INCPATH=$(prefix)/include
-LIBPATH=$(prefix)/lib
-
-# override DESTDIR= on the make install command line to easily support
-# installing into a temporary location.  Example:
-#
-#    make install DESTDIR=/tmp/build/libpng
-#
-# If you're going to install into a temporary location
-# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
-# you execute make install.
-DESTDIR=
-
-DI=$(DESTDIR)$(INCPATH)
-DL=$(DESTDIR)$(LIBPATH)
-
-WARNMORE =
 CPPFLAGS = -I$(ZLIBINC) # -DPNG_DEBUG=5
-CFLAGS = -W -Wall -O2 # $(WARNMORE) -g
-LDFLAGS = -L. -L$(ZLIBLIB) -lpng16 -lz -lm
+CFLAGS = -O2 # -g
+ARFLAGS = rc
+LDFLAGS = -L. -L$(ZLIBLIB) -lpng16 -lz -lm # -g
 
-# Variables
-OBJS =  png.o pngerror.o pngget.o pngmem.o pngpread.o \
-	pngread.o pngrio.o pngrtran.o pngrutil.o pngset.o \
-	pngtrans.o pngwio.o pngwrite.o pngwtran.o pngwutil.o
+# File lists
+OBJS = png.o pngerror.o pngget.o pngmem.o pngpread.o \
+       pngread.o pngrio.o pngrtran.o pngrutil.o pngset.o \
+       pngtrans.o pngwio.o pngwrite.o pngwtran.o pngwutil.o
 
 # Targets
 .c.o:
-	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $*.c
 
-all: $(LIBNAME).a pngtest$(E)
+all: $(LIBNAME).a pngtest
 
 include scripts/pnglibconf.mak
 REMOVE = $(RM_F)
 DFNFLAGS = $(DEFS) $(CPPFLAGS)
 
 $(LIBNAME).a: $(OBJS)
-	$(AR_RC) $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 	$(RANLIB) $@
 
-test: pngtest$(E)
-	./pngtest$(E)
+test: pngtest
+	./pngtest
 
-pngtest$(E): pngtest.o $(LIBNAME).a
+pngtest: pngtest.o $(LIBNAME).a
 	$(LD) -o $@ pngtest.o $(LDFLAGS)
 
-install: $(LIBNAME).a
-	-@if [ ! -d $(DI)  ]; then $(MKDIR_P) $(DI); fi
-	-@if [ ! -d $(DI)/$(LIBNAME)  ]; then $(MKDIR_P) $(DI)/$(LIBNAME); fi
-	-@if [ ! -d $(DL) ]; then $(MKDIR_P) $(DL); fi
-	-@$(RM_F) $(DI)/$(LIBNAME)/png.h
-	-@$(RM_F) $(DI)/$(LIBNAME)/pngconf.h
-	-@$(RM_F) $(DI)/$(LIBNAME)/pnglibconf.h
-	-@$(RM_F) $(DI)/png.h
-	-@$(RM_F) $(DI)/pngconf.h
-	-@$(RM_F) $(DI)/pnglibconf.h
-	cp png.h pngconf.h pnglibconf.h $(DI)/$(LIBNAME)
-	chmod 644 $(DI)/$(LIBNAME)/png.h \
-	$(DI)/$(LIBNAME)/pngconf.h \
-	$(DI)/$(LIBNAME)/pnglibconf.h
-	-@$(RM_F) -r $(DI)/libpng
-	(cd $(DI); $(LN_SF) $(LIBNAME) libpng; $(LN_SF) $(LIBNAME)/* .)
-	-@$(RM_F) $(DL)/$(LIBNAME).a
-	-@$(RM_F) $(DL)/libpng.a
-	cp $(LIBNAME).a $(DL)/$(LIBNAME).a
-	chmod 644 $(DL)/$(LIBNAME).a
-	(cd $(DL); $(LN_SF) $(LIBNAME).a libpng.a)
-	(cd $(DI); $(LN_SF) libpng/* .;)
+install:
+	@echo "The $@ target is no longer supported by this makefile."
+	@false
 
 clean:
 	$(RM_F) *.o $(LIBNAME).a pngtest pngout.png pnglibconf.h