[openwrt/openwrt] build: provide xxd -i with scripts/xxdi.pl

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/1c8c84620de64b20921873c998e93f72dbaccd2a

commit 1c8c84620de64b20921873c998e93f72dbaccd2a
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Tue Aug 30 08:45:39 2022 +0200

    build: provide xxd -i with scripts/xxdi.pl
    
    Dependency on xxd was added in commit c4dd2441e787 ("tools: add xxd
    (from vim)") as U-Boot requires xxd to create the default environment
    from an external file.
    
    Later in commit 2b94aac7a128 ("tools: xxd: use more convenient source
    tarball"), xxd from another source was used instead, but that source is
    currently unavailable, so let's fix it by using simple xxdi.pl Perl
    script instead.
    
    Fixes: #10555
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
    (cherry picked from commit eae2fb8027cb892e42181e471ba344aa5d26bf7e)
---
 include/prereq-build.mk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index d3593b0205..61cd8ae516 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -192,7 +192,10 @@ $(STAGING_DIR_HOST)/bin/mkhash: $(SCRIPT_DIR)/mkhash.c
 	mkdir -p $(dir $@)
 	$(CC) -O2 -I$(TOPDIR)/tools/include -o $@ $<
 
-prereq: $(STAGING_DIR_HOST)/bin/mkhash
+$(STAGING_DIR_HOST)/bin/xxd: $(SCRIPT_DIR)/xxdi.pl
+	$(LN) $< $@
+
+prereq: $(STAGING_DIR_HOST)/bin/mkhash $(STAGING_DIR_HOST)/bin/xxd
 
 # Install ldconfig stub
 $(eval $(call TestHostCommand,ldconfig-stub,Failed to install stub, \