heap: add window support for page size

Author: RossComputerGuy

lib/std/heap.zig

@@ -585,7 +585,12 @@ pub fn pageSize() usize {
     page_size = switch (builtin.os.tag) {
         .linux => if (builtin.link_libc) @intCast(std.c.sysconf(std.os.linux.SC.PAGESIZE)) else std.os.linux.getauxval(std.elf.AT_PAGESZ),
         .macos => std.os.darwin.machTaskForSelf().getPageSize() catch mem.page_size,
-        else => if (builtin.link_libc and @hasDecl(std.c, "getpagesize")) std.c.getpagesize() else mem.page_size,
+        .windows => blk: {
+            var info: std.os.windows.SYSTEM_INFO = undefined;
+            std.os.windows.kernel32.GetSystemInfo(&info);
+            break :blk info.dwPageSize;
+        },
+        else => if (builtin.link_libc and @hasDecl(std.c, "getpagesize")) @intCast(std.c.getpagesize()) else mem.page_size,
     };
     return page_size.?;
 }

src/Builtin.zig

@@ -152,7 +152,7 @@ pub fn append(opts: @This(), buffer: *std.ArrayList(u8)) Allocator.Error!void {
         ),
     }
     try buffer.writer().print(
-        \\};
+        \\}};
         \\pub const target: std.Target = .{{
         \\    .cpu = cpu,
         \\    .os = os,