[make] remove the need for a module to manually add $(LOCAL_DIR)/include to the global include path

Pretty much every module in the system was already doing it, so do it
automatically.

target/uzed/rules.mk

@@ -9,9 +9,6 @@ ZYNQ_USE_SRAM ?= 1
 
 ZYNQ_SDRAM_SIZE := 0x10000000
 
-GLOBAL_INCLUDES += \
-	$(LOCAL_DIR)/include
-
 GLOBAL_DEFINES += \
 	EXTERNAL_CLOCK_FREQ=33333333 \
 	TARGET_HAS_DEBUG_LED=1 \