use tools dir before PATH, fix ulimit ksh problem

Makefile

@@ -2,7 +2,7 @@
 # material, please see the LICENCE file in the top-level directory.
 
 _UNLIMIT=	__limit=$$(ulimit -dH 2>/dev/null); \
-		test -n "$$__limit" && ulimit -dS $$__limit;
+		test -n "$$__limit" && ulimit -Sd $$__limit;
 
 all: checkreloc .prereq_done
 	@${_UNLIMIT} ${GMAKE_INV} all

mk/kernel-vars.mk

@@ -23,4 +23,4 @@ ADK_KCPPFLAGS+=		-DBCM47XX_OVERRIDE_FLASHSIZE=0x800000 \
 			-DBCM47XX_OVERRIDE_CFESIZE=0x40000
 endif
 
-KERNEL_MAKE_ENV+=	KCPPFLAGS='${ADK_KCPPFLAGS}' PATH="$$PATH:${TOOLS_DIR}"
+KERNEL_MAKE_ENV+=	KCPPFLAGS='${ADK_KCPPFLAGS}' PATH="${TOOLS_DIR}:$$PATH"