groff: fix rare build race in hdtbl

It's possible to build the hdtbl examples before grn has been build:

groff: error: couldn't exec grn: No such file or directory

Backport a dependency fix from upstream.

[ YOCTO #15610 ]

(From OE-Core rev: d590a32423d05cefc4e7282f971f633b3fa0b941)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/groff/files/0001-hdtbl-Fix-Savannah-66316-missing-grn-dep.patch

@@ -0,0 +1,38 @@
+From 12169aa269341753d491a69e9adb86c58dca039a Mon Sep 17 00:00:00 2001
+From: "G. Branden Robinson" <g.branden.robinson@gmail.com>
+Date: Thu, 10 Oct 2024 18:17:08 -0500
+Subject: [PATCH] [hdtbl]: Fix Savannah #66316 (missing `grn` dep).
+
+* hdtbl.am (HDTBLPROCESSEDEXAMPLEFILES): Declare dependency on `grn`;
+  because `-I` flags are used, it is dragged in even though not
+  explicitly needed.  Resolves race against `grn`'s availability in the
+  build tree.
+
+Fixes <https://savannah.gnu.org/bugs/?66316>.  Thanks to Ross Burton for
+the report.
+
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ contrib/hdtbl/ChangeLog | 10 ++++++++++
+ contrib/hdtbl/hdtbl.am  |  3 +--
+ 2 files changed, 11 insertions(+), 2 deletions(-)
+
+diff --git a/contrib/hdtbl/hdtbl.am b/contrib/hdtbl/hdtbl.am
+index b6c334c18..3c37174f2 100644
+--- a/contrib/hdtbl/hdtbl.am
++++ b/contrib/hdtbl/hdtbl.am
+@@ -119,9 +119,8 @@ SUFFIXES += .roff .in .ps
+ 	&& sed -e "s|[@]fontdir[@]|$(fontdir)|" \
+ 	       -e "s|[@]EGREP[@]|$(EGREP)|" $< >$@
+ 
+-
+ $(HDTBLPROCESSEDEXAMPLEFILES): $(DOC_GNU_EPS) groff troff eqn pic tbl \
+-  grops font/devps/stamp contrib/hdtbl/examples/common.roff
++  grops grn font/devps/stamp contrib/hdtbl/examples/common.roff
+ 
+ uninstall_groffdirs: uninstall-hdtbl-hook
+ uninstall-hdtbl-hook:
+-- 
+2.34.1
+

meta/recipes-extended/groff/groff_1.23.0.bb

@@ -12,6 +12,7 @@ SRC_URI = "${GNU_MIRROR}/groff/groff-${PV}.tar.gz \
            file://0001-Make-manpages-mulitlib-identical.patch \
            file://0001-build-Fix-Savannah-64681-webpage.ps-deps.patch \
            file://0001-build-meintro_fr.ps-depends-on-tbl.patch \
+           file://0001-hdtbl-Fix-Savannah-66316-missing-grn-dep.patch \
            "
 
 SRC_URI[sha256sum] = "6b9757f592b7518b4902eb6af7e54570bdccba37a871fddb2d30ae3863511c13"