CMake: build shape and texture examples (#432)

examples/CMakeLists.txt

@@ -11,7 +11,7 @@ include_directories("../src/external")
 include_directories("../src/external/glfw/include")
 
 # Get the sources together
-set(example_dirs audio core models others shaders text texutures)
+set(example_dirs audio core models others shaders shapes text textures)
 set(CMAKE_REQUIRED_DEFINITIONS -D_POSIX_C_SOURCE=199309L)
   include(CheckSymbolExists)
   check_symbol_exists(CLOCK_MONOTONIC time.h HAVE_CLOCK_MONOTONIC)