fix(configure): make sysroot work

Author: RossComputerGuy

Step/Configure.zig

@@ -106,7 +106,7 @@ fn make(step: *std.Build.Step, _: *std.Progress.Node) anyerror!void {
         b.graph.zig_exe,
     }));
 
-    try env_map.put("CFLAGS", b.fmt("-target {s} -mcpu={s} -O{s}", .{
+    try env_map.put("CFLAGS", b.fmt("-target {s} -mcpu={s} -O{s}{s}", .{
         try self.target.query.zigTriple(arena),
         try self.target.query.serializeCpuAlloc(arena),
         @as([]const u8, switch (self.optimize) {
@@ -115,6 +115,7 @@ fn make(step: *std.Build.Step, _: *std.Progress.Node) anyerror!void {
             .ReleaseFast => "fast",
             .Debug => "g",
         }),
+        @as([]const u8, if (b.sysroot) |sysroot| b.fmt(" --sysroot {s}", .{sysroot}) else ""),
     }));
 
     if (b.findProgram(&.{"pkg-config"}, &.{}) catch null) |pkgconfig| {