Cleaned up some more superfluous makefile cruft

Makefile

@@ -15,10 +15,6 @@ FW_BASE		= firmware
 # the PATH.
 XTENSA_TOOLS_ROOT ?= 
 
-#Extra Tensilica includes from the ESS VM
-SDK_EXTRA_INCLUDES ?= /opt/Espressif/include
-SDK_EXTRA_LIBS ?= /opt/Espressif/arch/lib
-
 # base directory of the ESP8266 SDK package, absolute
 SDK_BASE	?= /opt/Espressif/ESP8266_SDK
 
@@ -37,8 +33,7 @@ TARGET		= httpd
 MODULES		= driver user
 EXTRA_INCDIR	= include \
 		. \
-		lib/heatshrink/ \
-		$(SDK_EXTRA_INCLUDES)
+		lib/heatshrink/
 
 # libraries used in this project, mainly provided by the SDK
 LIBS		= c gcc hal phy pp net80211 wpa main lwip
@@ -49,7 +44,7 @@ CFLAGS		= -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-
 		-Wno-address
 
 # linker flags used to generate the main object file
-LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -L$(SDK_EXTRA_LIBS)
+LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static
 
 # linker script used for the above linkier step
 LD_SCRIPT	= eagle.app.v6.ld