scripts: Remove the support for "install" targets from all makefiles

In most of the legacy makefiles (with only a few notable exceptions
such as makefile.linux), the "install" targets have been broken since
libpng-1.5.0beta01. Specifically, the "install-shared" targets produced
incorrect library names, due to a missing symbol in the definition of
the LIBSOREL macro.

Rather than correcting this long-standing and long-untested error, we
decided to remove the support for "make install" altogether, from all
legacy makefiles. Further use of "make install", "make install-static"
or "make install-shared" will fail with an error message.

Going forward, the only tested and supported manners to install libpng
shall be the conventional build and install procedures driven by the
configure script or by the CMake file.

scripts/makefile.aix

@@ -19,28 +19,10 @@ AR_RC = ar rcs
 RANLIB = ranlib
 MKDIR_P = mkdir -p
 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 = -O2 -Wall -Wextra -Wundef # $(WARNMORE) -g
@@ -55,7 +37,7 @@ OBJS = png.o pngerror.o pngget.o pngmem.o pngpread.o \
 .c.o:
 	$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
 
-all: $(LIBNAME).a pngtest$(E)
+all: $(LIBNAME).a pngtest
 
 include scripts/pnglibconf.mak
 REMOVE = $(RM_F)
@@ -65,34 +47,15 @@ $(LIBNAME).a: $(OBJS)
 	$(AR_RC) $@ $(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