patchSilence $(CC) command line when compiling test tools

> Like our other $(CC) rules in the Makefile we typically build with
> $(QUIET_CC) in front of $(CC) so that we hide the compiler options.
>
> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
> ---
>  Makefile |   14 +++++++-------
>  1 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 3680b09..25c3f37 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -956,25 +956,25 @@ test: all
>  	$(MAKE) -C t/ all
>  
>  test-date$X: test-date.c date.o ctype.o
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) test-date.c date.o ctype.o
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) test-date.c date.o ctype.o
>  
>  test-delta$X: test-delta.o diff-delta.o patch-delta.o $(GITLIBS)
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
>  
>  test-dump-cache-tree$X: dump-cache-tree.o $(GITLIBS)
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
>  
>  test-sha1$X: test-sha1.o $(GITLIBS)
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
>  
>  test-match-trees$X: test-match-trees.o $(GITLIBS)
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
>  
>  test-chmtime$X: test-chmtime.c
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $<
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $<
>  
>  test-genrandom$X: test-genrandom.c
> -	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $<
> +	$(QUIET_CC)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $<
>  
>  check-sha1:: test-sha1$X
>  	./test-sha1.sh