Add powerpc handling macho.

[uglyoldbob]

Add parsing for the powerpc and powerpc64 architecture types on the macho object type.

[bjorn3]

I think

object/src/read/macho/file.rs

Line 191 in 1f1b9b0

fn architecture(&self) -> Architecture {

also needs them.

[philipc]

Can you please support these for writing too:

object/src/write/macho.rs

Lines 324 to 328 in 1685737

	let (cputype, cpusubtype) = match self.architecture {
	Architecture::Arm => (macho::CPU_TYPE_ARM, macho::CPU_SUBTYPE_ARM_ALL),
	Architecture::Aarch64 => (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64_ALL),
	Architecture::I386 => (macho::CPU_TYPE_X86, macho::CPU_SUBTYPE_I386_ALL),
	Architecture::X86_64 => (macho::CPU_TYPE_X86_64, macho::CPU_SUBTYPE_X86_64_ALL),

[philipc]

Thanks!