Strip trailing slash from the user-supplied LUFA_PATH directory, to prevent double slashes from appearing in the commands/output.

LUFA/Build/lufa.build.in

@@ -104,7 +104,7 @@ else
   $(error Unsupported architecture.)
 endif
 CC_FLAGS += -Wall -fno-strict-aliasing -funsigned-char -funsigned-bitfields -ffunction-sections
-CC_FLAGS += -I. -I$(LUFA_PATH)/..
+CC_FLAGS += -I. -I$(patsubst %/,%,$(LUFA_PATH))/..
 CC_FLAGS += -DARCH=ARCH_$(ARCH) -DBOARD=BOARD_$(BOARD) -DF_USB=$(F_USB)UL
 ifneq ($(F_CPU),)
    CC_FLAGS += -DF_CPU=$(F_CPU)UL

LUFA/Build/lufa.sources.in

@@ -40,7 +40,7 @@ ARCH           ?= $(error Makefile ARCH value not set.)
 LUFA_PATH      ?= $(error Makefile LUFA_PATH value not set.)
 
 # Allow LUFA_ROOT_PATH to be overridden elsewhere to support legacy LUFA makefiles
-LUFA_ROOT_PATH ?= $(LUFA_PATH)
+LUFA_ROOT_PATH ?= $(patsubst %/,%,$(LUFA_PATH))
 
 # Construct LUFA module source variables
 LUFA_SRC_USB         = $(LUFA_ROOT_PATH)/Drivers/USB/Core/$(ARCH)/Device_$(ARCH).c          \