libjpeg: export include dirs

Export $(LOCAL_PATH) as an include dir to modules that depend on libjpeg
so they can include jpeglib.h.

Change-Id: I1c708ad587c073b97f382226bc34a22f24257d64
diff --git a/Android.mk b/Android.mk
index e36e56c..4640c6f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -61,6 +61,8 @@
 
 LOCAL_MODULE := libjpeg_static
 
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+
 include $(BUILD_STATIC_LIBRARY)
 
 
@@ -82,6 +84,8 @@
 LOCAL_SDK_VERSION := 17
 endif
 
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+
 include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)