sys-devel/gdb: add missing include on ia64

Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

sys-devel/gdb/files/gdb-9.1-ia64.patch

@@ -0,0 +1,15 @@
+https://sourceware.org/pipermail/gdb-patches/2020-May/168808.html
+
+--- a/gdb/ia64-linux-nat.c
++++ b/gdb/ia64-linux-nat.c
+@@ -21,6 +21,7 @@
+ #include "defs.h"
+ #include "inferior.h"
+ #include "target.h"
++#include "gdbarch.h"
+ #include "gdbcore.h"
+ #include "regcache.h"
+ #include "ia64-tdep.h"
+-- 
+2.26.2
+

sys-devel/gdb/gdb-9.1.ebuild

@@ -90,6 +90,7 @@ BDEPEND="
 
 PATCHES=(
 	"${FILESDIR}"/${PN}-8.3.1-verbose-build.patch
+	"${FILESDIR}"/${PN}-9.1-ia64.patch
 )
 
 GDB_BUILD_DIR="${WORKDIR}"/${P}-build