[source] build: let make check warn about use of legacy PKG_MD5SUM variable in feeds

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/5919cc2dc4a76026eb88379c38bab61aff1b5b77

commit 5919cc2dc4a76026eb88379c38bab61aff1b5b77
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu Jan 12 15:18:11 2017 +0100

    build: let make check warn about use of legacy PKG_MD5SUM variable in feeds
    
    The variable rename change has been merged in OpenWrt now, so it's
    possible to convert the feeds as well.
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/download.mk | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/include/download.mk b/include/download.mk
index b87686d..82a3dd2 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -94,13 +94,10 @@ endif
 
 C_md5_deprecated = Use of $(2) is deprecated, switch to $(3)
 
-# Skip MD5SUM check in feeds until OpenWrt is updated
-ifneq ($(filter $(foreach dir,package tools toolchain, $(TOPDIR)/$(dir)/%),$(CURDIR)),)
 check_md5 = \
   $(if $(filter-out x,$(1)), \
     $(call check_warn,md5_deprecated,$(1),$(2),$(3)) \
   )
-endif
 
 hash_var = $(if $(filter-out x,$(1)),MD5SUM,HASH)
 endif