std: Split syscall parameters for PowerPC targets

lib/std/os/linux.zig

@@ -52,6 +52,7 @@ pub fn getauxval(index: usize) usize {
 // Some architectures (and some syscalls) require 64bit parameters to be passed
 // in a even-aligned register pair.
 const require_aligned_register_pair =
+    std.Target.current.cpu.arch.isPPC() or
     std.Target.current.cpu.arch.isMIPS() or
     std.Target.current.cpu.arch.isARM() or
     std.Target.current.cpu.arch.isThumb();

lib/std/target.zig

@@ -800,6 +800,13 @@ pub const Target = struct {
                 };
             }
 
+            pub fn isPPC(arch: Arch) bool {
+                return switch (arch) {
+                    .powerpc, .powerpcle => true,
+                    else => false,
+                };
+            }
+
             pub fn isPPC64(arch: Arch) bool {
                 return switch (arch) {
                     .powerpc64, .powerpc64le => true,