build: prepare for x86 EFI loader

Change-Id: Ic9e4181042bf634cd590d8c95935a987a4871b0d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4753
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>

build/jam/ImageRules

@@ -1685,6 +1685,8 @@ rule BuildEfiSystemPartition image : efiLoader
 	Depends $(image) : $(fatshell) ;
 
 	switch $(TARGET_ARCH) {
+		case x86 :
+			EFINAME on $(image) = "BOOTIA32.EFI" ;
 		case x86_64 :
 			EFINAME on $(image) = "BOOTX64.EFI" ;
 		case arm :

build/jam/images/MMCImage

@@ -22,6 +22,8 @@ rule BuildSDImage image : files
 
 	if $(TARGET_BOOT_PLATFORM) = efi {
 		switch $(TARGET_ARCH) {
+			case x86 :
+				EFINAME on $(image) = "BOOTIA32.EFI" ;
 			case x86_64 :
 				EFINAME on $(image) = "BOOTX64.EFI" ;
 			case arm :