build: Pull common fragments into a build.rules file

Some things are used by most of the binaries, pull them
into a common rule fragment that we can use properly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

wlantest/Makefile

@@ -1,22 +1,9 @@
 ALL=wlantest wlantest_cli test_vectors
 
-all: $(ALL)
+include ../src/build.rules
 
 UNAME := $(shell uname -s)
 
-ifndef CC
-CC=gcc
-endif
-
-ifndef RANLIB
-RANLIB=ranlib
-endif
-
-ifndef CFLAGS
-CFLAGS = -MMD -O2 -Wall -g
-endif
-
-
 CFLAGS += -I.
 CFLAGS += -I../src
 CFLAGS += -I../src/utils
@@ -26,26 +13,6 @@ ifneq ($(UNAME),Darwin)
 LIBS += -lrt
 endif
 
-ifndef LDO
-LDO=$(CC)
-endif
-
-Q=@
-E=echo
-ifeq ($(V), 1)
-Q=
-E=true
-endif
-ifeq ($(QUIET), 1)
-Q=@
-E=true
-endif
-
-%.o: %.c
-	$(Q)$(CC) -c -o $@ $(CFLAGS) $<
-	@$(E) "  CC " $<
-
-
 OWN_LIBS += ../src/utils/libutils.a
 OWN_LIBS += ../src/crypto/libcrypto.a