remove objcopy --weaken from the makefile

as far as I can tell, it's not useful and never way. I wrote it way
back under the assumption that non-weak symbols in the POSIX or
extension namespace could conflict with legitimate uses of the same
symbol name in the main program or other libraries, but that does not
seem to be the case.

Makefile

@@ -27,7 +27,6 @@ INC     = -I./src/internal -I./include -I./arch/$(ARCH)
 PIC     = -fPIC -O3
 AR      = $(CROSS_COMPILE)ar
 RANLIB  = $(CROSS_COMPILE)ranlib
-OBJCOPY = $(CROSS_COMPILE)objcopy
 
 ALL_INCLUDES = $(sort $(wildcard include/*.h include/*/*.h) $(GENH))
 
@@ -80,7 +79,6 @@ include/bits/alltypes.h: include/bits/alltypes.h.sh
 
 lib/libc.so: $(LOBJS)
 	$(CC) $(LDFLAGS) -Wl,-soname=libc.so -o $@ $(LOBJS) -lgcc
-	$(OBJCOPY) --weaken $@
 
 lib/libc.a: $(OBJS)
 	rm -f $@