Identify non-local EXPORT_C_INCLUDE_DIRS in soong_to_convert

Soong only supports exporting include directories under the current
directory. So bring non-local directories up as a potential problem in
soong_to_convert.txt

Test: m -j $OUT/soong_to_convert.txt, inspect
Change-Id: I7a15b92e10a1d8b8d3496c6f0529a0d0824f301e
diff --git a/core/binary.mk b/core/binary.mk
index 848bba9..b37ef80 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -1805,6 +1805,10 @@
 $(LOCAL_BUILT_MODULE) : | $(export_includes) $(my_link_type)
 
 ifneq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
+ifneq (,$(filter-out $(LOCAL_PATH)/%,$(my_export_c_include_dirs)))
+my_soong_problems += non_local__export_c_include_dirs
+endif
+
 SOONG_CONV.$(LOCAL_MODULE).PROBLEMS := \
     $(SOONG_CONV.$(LOCAL_MODULE).PROBLEMS) $(my_soong_problems)
 SOONG_CONV.$(LOCAL_MODULE).DEPS := \