tools power turbostat: Override CFLAGS assignments and add LDFLAGS to build command

So that the user can specify outside CFLAGS/LDFLAGS values.
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Herton Krzesinski <herton@redhat.com>
Cc: Len Brown <len.brown@intel.com>
Link: http://lkml.kernel.org/r/20181212102537.25902-5-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/power/x86/turbostat/Makefile

@@ -9,13 +9,13 @@ ifeq ("$(origin O)", "command line")
 endif
 
 turbostat : turbostat.c
-CFLAGS +=	-Wall
-CFLAGS +=	-DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"'
-CFLAGS +=	-DINTEL_FAMILY_HEADER='"../../../../arch/x86/include/asm/intel-family.h"'
+override CFLAGS +=	-Wall
+override CFLAGS +=	-DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"'
+override CFLAGS +=	-DINTEL_FAMILY_HEADER='"../../../../arch/x86/include/asm/intel-family.h"'
 
 %: %.c
 	@mkdir -p $(BUILD_OUTPUT)
-	$(CC) $(CFLAGS) $< -o $(BUILD_OUTPUT)/$@
+	$(CC) $(CFLAGS) $< -o $(BUILD_OUTPUT)/$@ $(LDFLAGS)
 
 .PHONY : clean
 clean :