Add examples/shaders/shaders_lightmap.c to Makefiles (#3276)

examples/Makefile

@@ -529,6 +529,7 @@ SHADERS = \
     shaders/shaders_simple_mask \
     shaders/shaders_spotlight \
     shaders/shaders_hot_reloading \
+    shaders/shaders_lightmap \
     shaders/shaders_mesh_instancing \
     shaders/shaders_multi_sample2d \
     shaders/shaders_write_depth \

examples/Makefile.Web

@@ -504,6 +504,7 @@ SHADERS = \
     shaders/shaders_simple_mask \
     shaders/shaders_spotlight \
     shaders/shaders_hot_reloading \
+    shaders/shaders_lightmap \
     shaders/shaders_mesh_instancing \
     shaders/shaders_multi_sample2d \
     shaders/shaders_write_depth \