Completely disable building oprofile on host.

Was trying to build some components even when HAVE_LIBBFD was false.

Change-Id: Ied9aefcc42070ae2e6cd7cc64f7323f72e64dd82
diff --git a/libregex/Android.mk b/libregex/Android.mk
index fc70ab3..ba1c4df 100644
--- a/libregex/Android.mk
+++ b/libregex/Android.mk
@@ -16,6 +16,7 @@
 include $(LOCAL_PATH)/../common.mk
 
 # Build libregex on host
+ifeq ($(HAVE_LIBBFD),true)
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
@@ -30,4 +31,4 @@
 LOCAL_MODULE := libop_regex
 
 include $(BUILD_HOST_STATIC_LIBRARY)
-
+endif