ppc: Minor tweaks to get the arch compile again (WIP)

- Factor in types changes (introduction of intptr_t)
- Align JamFiles syntax with in progress architectures (arm/sparc)
- Xorriso doesn't support much of the mkisofs options (anymore ?)
- (After a correct bootstrap) one should be able to build @minimum-raw and haiku-boot-cd again
Change-Id: I4f779ad8f2210389fa9b7f7c0a98c3652a64c257
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1983
Reviewed-by: François Revol <[email protected]>

headers/private/system/arch/ppc/asm_defs.h

@@ -2,8 +2,8 @@
  * Copyright 2008, Ingo Weinhold, [email protected].
  * Distributed under the terms of the MIT License.
  */
-#ifndef SYSTEM_ARCH_X86_ASM_DEFS_H
-#define SYSTEM_ARCH_X86_ASM_DEFS_H
+#ifndef SYSTEM_ARCH_PPC_ASM_DEFS_H
+#define SYSTEM_ARCH_PPC_ASM_DEFS_H
 
 
 #define SYMBOL(name)			.global name; name
@@ -13,5 +13,5 @@
 #define FUNCTION_END(name)		1: .size name, 1b - name
 
 
-#endif	/* SYSTEM_ARCH_X86_ASM_DEFS_H */
+#endif	/* SYSTEM_ARCH_PPC_ASM_DEFS_H */