Zig update: target.isArm now returns true for thumb

ref ziglang/zig#21599

Closes Vexu#779

Author: ehaas

src/aro/Driver.zig

@@ -1077,7 +1077,7 @@ pub fn getPICMode(d: *Driver, lastpic: []const u8) !struct { backend.CodeGenOpti
         return .{ if (pic) .two else .none, false };
     }
 
-    const embedded_pi_supported = target.cpu.arch.isArmOrThumb();
+    const embedded_pi_supported = target.cpu.arch.isArm();
     if (!embedded_pi_supported) {
         if (d.ropi) try d.unsupportedOptionForTarget(target, "-fropi");
         if (d.rwpi) try d.unsupportedOptionForTarget(target, "-frwpi");

src/aro/toolchains/Linux.zig

@@ -40,7 +40,7 @@ fn buildExtraOpts(self: *Linux, tc: *const Toolchain) !void {
         self.extra_opts.appendAssumeCapacity("relro");
     }
 
-    if (target.cpu.arch.isARM() or target.cpu.arch.isAARCH64() or is_android) {
+    if ((target.cpu.arch.isArm() and !target.cpu.arch.isThumb()) or target.cpu.arch.isAARCH64() or is_android) {
         try self.extra_opts.ensureUnusedCapacity(gpa, 2);
         self.extra_opts.appendAssumeCapacity("-z");
         self.extra_opts.appendAssumeCapacity("max-page-size=4096");