[efi] Minimise use of iPXE header files when building host utilities

Avoid dragging in unnecessary iPXE header files such as <ipxe/uuid.h>
and <ipxe/tables.h> when building host utilities, and ensure that
FILE_LICENCE() (present in the imported EDK2 headers) expands to a
no-op.

Reported-by: Michael Tautschnig <mt@debian.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/util/efifatbin.c

  * 02110-1301, USA.
  */
 
+#define FILE_LICENCE(...) extern void __file_licence ( void )
 #include <stdint.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <assert.h>
 #include <getopt.h>
-#include <ipxe/efi/efi.h>
+#include <ipxe/efi/Uefi.h>
 #include <ipxe/efi/IndustryStandard/PeImage.h>
 
 #define eprintf(...) fprintf ( stderr, __VA_ARGS__ )

src/util/efirom.c

  * 02110-1301, USA.
  */
 
+#define FILE_LICENCE(...) extern void __file_licence ( void )
 #include <stdint.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <assert.h>
 #include <getopt.h>
-#include <ipxe/efi/efi.h>
+#include <ipxe/efi/Uefi.h>
 #include <ipxe/efi/IndustryStandard/PeImage.h>
 #include <ipxe/efi/IndustryStandard/Pci22.h>
 

src/util/elf2efi.c

 #define _GNU_SOURCE
 #define PACKAGE "elf2efi"
 #define PACKAGE_VERSION "1"
+#define FILE_LICENCE(...) extern void __file_licence ( void )
 #include <stdint.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <getopt.h>
 #include <bfd.h>
-#include <ipxe/efi/efi.h>
+#include <ipxe/efi/Uefi.h>
 #include <ipxe/efi/IndustryStandard/PeImage.h>
 #include <libgen.h>