[build.zig] improve build system for zig

Is now possible to switch platform

Is now possible to diable raudio, rmodels, and so on

Made getOptions public so it can be used for zig wrappers

build.zig

@@ -12,8 +12,6 @@ comptime {
 }
 
 fn setDesktopPlatform(raylib: *std.Build.Step.Compile, platform: PlatformBackend) void {
-    raylib.defineCMacro("PLATFORM_DESKTOP", null);
-
     switch (platform) {
         .glfw => raylib.defineCMacro("PLATFORM_DESKTOP_GLFW", null),
         .rgfw => raylib.defineCMacro("PLATFORM_DESKTOP_RGFW", null),
@@ -58,6 +56,7 @@ const config_h_flags = outer: {
     var lines = std.mem.tokenizeScalar(u8, config_h, '\n');
     while (lines.next()) |line| {
         if (!std.mem.containsAtLeast(u8, line, 1, "SUPPORT")) continue;
+        if (std.mem.containsAtLeast(u8, line, 1, "MODULE")) continue;
         if (std.mem.startsWith(u8, line, "//")) continue;
         if (std.mem.startsWith(u8, line, "#if")) continue;
 
@@ -94,10 +93,9 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
         });
     }
 
+    // Sets a flag indiciating the use of a custom `config.h`
+    try raylib_flags_arr.append("-DEXTERNAL_CONFIG_FLAGS");
     if (options.config.len > 0) {
-        // Sets a flag indiciating the use of a custom `config.h`
-        try raylib_flags_arr.append("-DEXTERNAL_CONFIG_FLAGS");
-
         // Splits a space-separated list of config flags into multiple flags
         //
         // Note: This means certain flags like `-x c++` won't be processed properly.
@@ -126,6 +124,9 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
             // Otherwise, append default value from config.h to compile flags
             try raylib_flags_arr.append(flag);
         }
+    } else {
+        // Set default config if no custome config got set
+        try raylib_flags_arr.appendSlice(&config_h_flags);
     }
 
     const raylib = if (options.shared)
@@ -150,26 +151,32 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
     var c_source_files = try std.ArrayList([]const u8).initCapacity(b.allocator, 2);
     c_source_files.appendSliceAssumeCapacity(&.{ "src/rcore.c", "src/utils.c" });
 
-    if (options.raudio) {
-        try c_source_files.append("src/raudio.c");
-    }
-    if (options.rmodels) {
-        try c_source_files.append("src/rmodels.c");
-    }
     if (options.rshapes) {
         try c_source_files.append("src/rshapes.c");
+        try raylib_flags_arr.append("-DSUPPORT_MODULE_RSHAPES");
+    }
+    if (options.rtextures) {
+        try c_source_files.append("src/rtextures.c");
+        try raylib_flags_arr.append("-DSUPPORT_MODULE_RTEXTURES");
     }
     if (options.rtext) {
         try c_source_files.append("src/rtext.c");
+        try raylib_flags_arr.append("-DSUPPORT_MODULE_RTEXT");
     }
-    if (options.rtextures) {
-        try c_source_files.append("src/rtextures.c");
+    if (options.rmodels) {
+        try c_source_files.append("src/rmodels.c");
+        try raylib_flags_arr.append("-DSUPPORT_MODULE_RMODELS");
+    }
+    if (options.raudio) {
+        try c_source_files.append("src/raudio.c");
+        try raylib_flags_arr.append("-DSUPPORT_MODULE_RAUDIO");
     }
 
     if (options.opengl_version != .auto) {
         raylib.defineCMacro(options.opengl_version.toCMacroStr(), null);
     }
 
+    raylib.addIncludePath(b.path("src/platforms"));
     switch (target.result.os.tag) {
         .windows => {
             try c_source_files.append("src/rglfw.c");
@@ -329,7 +336,7 @@ pub const Options = struct {
 
     const defaults = Options{};
 
-    fn getOptions(b: *std.Build) Options {
+    pub fn getOptions(b: *std.Build) Options {
         return .{
             .platform = b.option(PlatformBackend, "platform", "Choose the platform backedn for desktop target") orelse defaults.platform,
             .raudio = b.option(bool, "raudio", "Compile with audio support") orelse defaults.raudio,