drop ppc default for size in MAKEALL

the host size should be sufficient for most cases when CROSS_COMPILE is not set when running MAKEALL ... better than getting a weird warning about ppc_8xx-size not being found

---

index a9969a3..2ef75e9 100755
@@ -339,7 +339,7 @@ build_target() {
 	${MAKE} ${JOBS} all 2>&1 >${LOG_DIR}/$target.MAKELOG \
 				| tee ${LOG_DIR}/$target.ERR
 
-	${CROSS_COMPILE:-ppc_8xx-}size ${BUILD_DIR}/u-boot \
+	${CROSS_COMPILE}size ${BUILD_DIR}/u-boot \
 				| tee -a ${LOG_DIR}/$target.MAKELOG
 }
 

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