`AR` does not need the absolute path

Still use `find` to get rid of potential ARGV limit overflow, since
rustc-genrated object file names are mangled and very long.

template/Makefile.in

@@ -309,11 +309,12 @@ $(LIBRUBY_A):
 		$(Q) if [ 'no' != '$(YJIT_SUPPORT)' ]; then \
 		  set -eu && \
 		  echo 'merging $(YJIT_LIBS) into $@' && \
-		  $(RMALL)    '$(CARGO_TARGET_DIR)/libyjit/' && \
-		  $(MAKEDIRS) '$(CARGO_TARGET_DIR)/libyjit/' && \
-		  $(CP) '$(YJIT_LIBS)' '$(CARGO_TARGET_DIR)/libyjit/' && \
-		  (cd '$(CARGO_TARGET_DIR)/libyjit/' && $(AR) -x libyjit.a) && \
-		  find '$(CARGO_TARGET_DIR)/libyjit/' -name '*.o' -exec $(AR) $(ARFLAGS) $@ '{}' '+' ; \
+		  $(RMALL)    libyjit/ && \
+		  $(MAKEDIRS) libyjit/ && \
+		  $(CP) '$(YJIT_LIBS)' libyjit/ && \
+		  (cd libyjit/ && $(AR) -x libyjit.a) && \
+		  :  "$(AR) $(ARFLAGS) $@ libyjit/*.$(OBJEXT)" && \
+		  find libyjit/ -name '*.$(OBJEXT)' -exec $(AR) $(ARFLAGS) $@ '{}' '+' ; \
 		fi
 		@-$(RANLIB) $@ 2> /dev/null || true