[D3D9] Fix compilation

Backends/Graphics4/Direct3D9/Sources/kinc/backend/graphics4/compute.cpp

@@ -0,0 +1,22 @@
+#include <kinc/graphics4/compute.h>
+#include <kinc/graphics4/rendertarget.h>
+#include <kinc/graphics4/texture.h>
+#include <kinc/math/core.h>
+
+void kinc_g4_compute_shader_init(kinc_g4_compute_shader *shader, void *source, int length) {}
+
+void kinc_g4_compute_shader_destroy(kinc_g4_compute_shader *shader) {}
+
+kinc_g4_constant_location_t kinc_g4_compute_shader_get_constant_location(kinc_g4_compute_shader *shader, const char *name) {
+	kinc_g4_constant_location_t location = {0};
+	return location;
+}
+
+kinc_g4_texture_unit_t kinc_g4_compute_shader_get_texture_unit(kinc_g4_compute_shader *shader, const char *name) {
+	kinc_g4_texture_unit_t unit = {0};
+	return unit;
+}
+
+void kinc_g4_set_compute_shader(kinc_g4_compute_shader *shader) {}
+
+void kinc_g4_compute(int x, int y, int z) {}

Backends/Graphics4/Direct3D9/Sources/kinc/backend/graphics4/compute.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct kinc_g4_compute_shader_impl {
+	int nothing;
+} kinc_g4_compute_shader_impl;
+
+#ifdef __cplusplus
+}
+#endif