make: enable setting target from ENV
SIL ?= @
-#TARGET = ia32
-#TARGET = armv7-stm32
-#TARGET = armv7-imxrt
-#TARGET = arm-imx
-TARGET = riscv64
+#TARGET ?= ia32
+#TARGET ?= armv7-stm32
+#TARGET ?= armv7-imxrt
+#TARGET ?= arm-imx
+TARGET ?= riscv64
VERSION = 2.80
CORE_VERSION = 1.0
