update more "realpath" callsites

lib/std/Build.zig

@@ -1762,7 +1762,10 @@ fn supportedWindowsProgramExtension(ext: []const u8) bool {
 }
 
 fn tryFindProgram(b: *Build, full_path: []const u8) ?[]const u8 {
-    if (fs.realpathAlloc(b.allocator, full_path)) |p| {
+    const io = b.graph.io;
+    const arena = b.allocator;
+
+    if (Io.Dir.realPathFileAbsoluteAlloc(io, full_path, arena)) |p| {
         return p;
     } else |err| switch (err) {
         error.OutOfMemory => @panic("OOM"),
@@ -1776,7 +1779,11 @@ fn tryFindProgram(b: *Build, full_path: []const u8) ?[]const u8 {
             while (it.next()) |ext| {
                 if (!supportedWindowsProgramExtension(ext)) continue;
 
-                return fs.realPathFileAlloc(b.graph.io, b.fmt("{s}{s}", .{ full_path, ext }), b.allocator) catch |err| switch (err) {
+                return Io.Dir.realPathFileAbsoluteAlloc(
+                    io,
+                    b.fmt("{s}{s}", .{ full_path, ext }),
+                    arena,
+                ) catch |err| switch (err) {
                     error.OutOfMemory => @panic("OOM"),
                     else => continue,
                 };

test/standalone/windows_bat_args/test.zig

@@ -101,7 +101,7 @@ pub fn main() anyerror!void {
     //     operable program or batch file.
     try std.testing.expectError(error.FileNotFound, testExecBat(gpa, "args1.bat .. ", &.{"abc"}, null));
     const absolute_with_trailing = blk: {
-        const absolute_path = try std.fs.realpathAlloc(gpa, "args1.bat");
+        const absolute_path = try Io.Dir.realPathFileAbsoluteAlloc(io, "args1.bat", gpa);
         defer gpa.free(absolute_path);
         break :blk try std.mem.concat(gpa, u8, &.{ absolute_path, " .. " });
     };

test/standalone/windows_spawn/main.zig

@@ -22,11 +22,11 @@ pub fn main() anyerror!void {
     var tmp = std.testing.tmpDir(.{});
     defer tmp.cleanup();
 
-    const tmp_absolute_path = try tmp.dir.realpathAlloc(gpa, ".");
+    const tmp_absolute_path = try tmp.dir.realPathFileAlloc(io, ".", gpa);
     defer gpa.free(tmp_absolute_path);
     const tmp_absolute_path_w = try std.unicode.utf8ToUtf16LeAllocZ(gpa, tmp_absolute_path);
     defer gpa.free(tmp_absolute_path_w);
-    const cwd_absolute_path = try Io.Dir.cwd().realpathAlloc(gpa, ".");
+    const cwd_absolute_path = try Io.Dir.cwd().realPathFileAlloc(io, ".", gpa);
     defer gpa.free(cwd_absolute_path);
     const tmp_relative_path = try std.fs.path.relative(gpa, cwd_absolute_path, tmp_absolute_path);
     defer gpa.free(tmp_relative_path);

tools/fetch_them_macos_headers.zig

@@ -134,7 +134,7 @@ fn fetchTarget(
 ) !void {
     const tmp_filename = "macos-headers";
     const headers_list_filename = "macos-headers.o.d";
-    const tmp_path = try tmp.dir.realpathAlloc(arena, ".");
+    const tmp_path = try tmp.dir.realPathFileAlloc(io, ".", arena);
     const tmp_file_path = try Dir.path.join(arena, &[_][]const u8{ tmp_path, tmp_filename });
     const headers_list_path = try Dir.path.join(arena, &[_][]const u8{ tmp_path, headers_list_filename });