pass target arch to final image builder as TARGETARCH; use TARGETARCH when generating raw and iso, fallback to build arch; use updated images that read TARGETARCH; ensure grub has EFI for all archs

Signed-off-by: Avi Deitcher <avi@deitcher.net>

tools/grub-dev/patches/treat-R_X86_64_PLT32-as-R_X86_64_PC32.patch

@@ -0,0 +1,30 @@
+---
+ util/grub-module-verifier.c | 1 +
+ util/grub-mkimagexx.c | 1 +
+ 2 files changed, 2 insertion(+)
+
+diff --git a/util/grub-mkimagexx.c b/util/grub-mkimagexx.c
+
+--- a/util/grub-mkimagexx.c
++++ b/util/grub-mkimagexx.c
+@@ -832,6 +832,7 @@
+ 		  break;
+
+ 		case R_X86_64_PC32:
++		case R_X86_64_PLT32:
+ 		  {
+ 		    grub_uint32_t *t32 = (grub_uint32_t *) target;
+ 		    *t32 = grub_host_to_target64 (grub_target_to_host32 (*t32)
+
+diff --git a/util/grub-module-verifier.c b/util/grub-module-verifier.c
+
+--- a/util/grub-module-verifier.c
++++ b/util/grub-module-verifier.c
+@@ -19,6 +19,7 @@
+       -1
+     }, (int[]){
+       R_X86_64_PC32,
++      R_X86_64_PLT32,
+       -1
+     }
+   },