Cleanup get_mem for Open-/FreeBSD

Remove unnecessary files, use ifdef to decide
for which platform to compile for.

Makefile

@@ -1,27 +1,17 @@
-# OS=$(uname) make 
-
-### OS = OpenBSD
-### OS = FreeBSD
 PROG=       xmem
 VERSION=    1.27
-FreeBSD_lflag=   -lkvm
-LDFLAGS+=   -L/usr/X11R6/lib -L/usr/local/lib/ -lX11 -lXt -lXaw -lXmu 
-LDFLAGS+=   $($(OS)_lflag)
+LDFLAGS+=   -L/usr/X11R6/lib -L/usr/local/lib/ -lX11 -lXt -lXaw -lXmu
+LDFLAGS+=   -lkvm
 CFLAGS+=    -Wall -I/usr/X11R6/include/ -I/usr/local/include/
-OBJECTS=    xmem.o  MemStripChart.o
-FreeBSD_stub =   get_mem_fbsd.o
-OpenBSD_stub =   get_mem.o
-_stub =   get_mem.o
-OBJECTS += $($(OS)_stub)
-
+OBJECTS=    xmem.o  MemStripChart.o get_mem.o
 
 all: xmem
 
 xmem.full:
-	echo "full not supported yet" 
+	@echo "full not supported yet"
 
 xmem.debug:
-	echo "debug not supported yet"
+	@echo "debug not supported yet"
 
 xmem: $(OBJECTS)
 	$(CC) -o xmem $(OBJECTS) $(LDFLAGS)
@@ -29,10 +19,10 @@ xmem: $(OBJECTS)
 %.o: %c
 	$(CC) $(CFLAGS) -c $<
 
-clean: 
+clean:
 	-rm -rf $(OBJECTS) $(PROG)
 
-dist: 
+dist:
 	mkdir -p ${PROG}-${VERSION}
 	cp *.h *.c Makefile xmem.1 xmem.bit copyright XMem.ad ${PROG}-${VERSION}
 	tar cfvz ${PROG}-${VERSION}.tar.gz ${PROG}-${VERSION}
@@ -48,9 +38,8 @@ install:
 	install -c -o root -g bin -m 644 xmem.1 ${PREFIX}/man/man1/xmem.1
 	install -d -m 755 ${PREFIX}/lib/X11/app-defaults/
 	install -c -o root -g bin -m 644 XMem.ad ${PREFIX}/lib/X11/app-defaults/XMem
-	install -d -m 755 ${PREFIX}/share/${PROG}/ 
+	install -d -m 755 ${PREFIX}/share/${PROG}/
 	install -c -o root -g bin -m 644 xmem.bit ${PREFIX}/share/${PROG}/xmem.bit
 	install -c -o root -g bin -m 644 copyright ${PREFIX}/share/${PROG}/copyright
 
-
 .include <bsd.prog.mk>