Add Memtest86+ to x86_64 UEFI GRUB boot menu

Implements #203.

grub/grub.cfg

@@ -46,6 +46,11 @@ menuentry "Arch Linux install medium with speakup screen reader (x86_64, UEFI)"
 
 if [ "${grub_platform}" == "efi" ]; then
     if [ "${grub_cpu}" == "x86_64" ]; then
+        menuentry "Run Memtest86+ (RAM test)" --class memtest86 --class gnu --class tool {
+            set gfxpayload=800x600,1024x768
+            search --fs-uuid --no-floppy --set=root --label %ARCHISO_LABEL%
+            linux /%INSTALL_DIR%/boot/memtest.efi
+        }
         menuentry "UEFI Shell" {
             insmod chain
             search --no-floppy --set=root --label %ARCHISO_LABEL%

packages.x86_64

@@ -60,6 +60,7 @@ man-pages
 mc
 mdadm
 memtest86+
+memtest86+-efi
 mkinitcpio
 mkinitcpio-archiso
 mkinitcpio-nfs-utils