build: Update the makefiles for the benefit of cross-compilation

Split AR_RC into AR and ARFLAGS. The variables AR and ARFLAGS are
de-facto standards (like CC and CFLAGS, LD and LDFLAGS, etc.) that
may be overridden when running make. Moreover, configuring CC, LD,
AR, etc., to point to a cross-platform compiler, linker, librarian,
etc., is a de-facto standard practice as well.

Also remove the MKDIR_P variable definitions from all makefiles.
They've been leftovers from the removal of the "install*" targets.

scripts/makefile.linux

@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng16.so on Linux ELF with gcc
-# Copyright (C) 2020-2022 Cosmin Truta
+# Copyright (C) 2020-2024 Cosmin Truta
 # Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010-2014 Greg Roelofs and
 # Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
@@ -18,9 +18,8 @@ LIBSOMAJ=$(LIBNAME).so.$(PNGMAJ)
 
 # Utilities:
 CC=gcc
-AR_RC=ar rc
+AR=ar
 RANLIB=ranlib
-MKDIR_P=mkdir -p
 LN_SF=ln -sf
 CP=cp
 RM_F=rm -f
@@ -40,6 +39,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 DEFS=$(NOHWOPT)
 CPPFLAGS=-I$(ZLIBINC) $(DEFS) # -DPNG_DEBUG=5
 CFLAGS=-O3 -funroll-loops -Wall -Wextra -Wundef # $(WARNMORE) -g
+ARFLAGS=rc
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng16 -lz -lm # -g
 LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm # -g
 
@@ -68,7 +68,7 @@ pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
 	$(CP) $(PNGLIBCONF_H_PREBUILT) $@
 
 libpng.a: $(OBJS)
-	$(AR_RC) $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 	$(RANLIB) $@
 
 $(LIBSO): $(LIBSOMAJ)