rules_mk: don't include wrapped bin with external toolchains

Don't add wrapped bin to the TARGET_PATH as it does cause compilation
error.

cmake.mk will use the "command -v" and will use the wrapped bin instead
of the external toolchain bin as they have the same name and command
will select the first result.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

rules.mk

@@ -208,7 +208,6 @@ ifndef DUMP
       ifneq ($(TOOLCHAIN_LIB_DIRS),)
         TARGET_LDFLAGS+= $(patsubst %,-L%,$(TOOLCHAIN_LIB_DIRS))
       endif
-      TARGET_PATH:=$(TOOLCHAIN_DIR)/bin:$(TARGET_PATH)
     endif
   endif
 endif