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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.
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@@ -11,13 +11,12 @@ CFLAGS = NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL IDIR /zlib \
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OPTLOOP OPTRDEP=8 OPTDEP=8 OPTCOMP=8
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LIBNAME = libpng.a
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AR = ppc-amigaos-ar
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AR_FLAGS = cr
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ARFLAGS = cr
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RANLIB = ppc-amigaos-ranlib
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LDFLAGS = -r -o
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LDLIBS = ../zlib/libzip.a LIB:scppc.a
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LN = ppc-amigaos-ld
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RM = delete quiet
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MKDIR = makedir
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OBJS = png.o pngerror.o pngget.o pngmem.o pngpread.o \
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pngread.o pngrio.o pngrtran.o pngrutil.o pngset.o \
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@@ -26,7 +25,7 @@ OBJS = png.o pngerror.o pngget.o pngmem.o pngpread.o \
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all: $(LIBNAME) pngtest
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$(LIBNAME): $(OBJS)
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$(AR) $(AR_FLAGS) $@ $(OBJS)
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$(AR) $(ARFLAGS) $@ $(OBJS)
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$(RANLIB) $@
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pngtest: pngtest.o $(LIBNAME)
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