Revert "build glfw"

This reverts commit f0e7be542b.

cimgui/build.zig

@@ -1,6 +1,5 @@
 const std = @import("std");
 const vkgen = @import("vulkan-zig");
-const glfw_util = @import("glfw");
 
 pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
@@ -8,7 +7,6 @@ pub fn build(b: *std.Build) !void {
 
     const imgui_dep = b.dependency("imgui", .{});
     const cimgui_dep = b.dependency("cimgui", .{});
-    const glfw_dep = b.dependency("glfw", .{});
 
     const luajit = try b.findProgram(&.{"luajit"}, &.{});
 
@@ -76,7 +74,13 @@ pub fn build(b: *std.Build) !void {
     });
     cimgui.installHeader(copy.getDirectory().path(b, "cimgui.h"), "cimgui.h");
     cimgui.installHeader(copy.getDirectory().path(b, "cimgui_impl.h"), "cimgui_impl.h");
-    glfw_util.link(glfw_dep, cimgui);
+
+    // todo separate impls into different shared libraries for easier linkage
+    cimgui.linkSystemLibrary2("glfw3", .{
+        .needed = true,
+        .preferred_link_mode = .static,
+        .use_pkg_config = .force,
+    });
 
     b.installArtifact(cimgui);