build smaller binary size

Author: nihui

src/CMakeLists.txt

@@ -94,6 +94,7 @@ if(NOT USE_SYSTEM_NCNN)
     option(NCNN_INSTALL_SDK "" OFF)
     option(NCNN_PIXEL_ROTATE "" OFF)
     option(NCNN_PIXEL_AFFINE "" OFF)
+    option(NCNN_PIXEL_DRAWING "" OFF)
     option(NCNN_VULKAN "" ON)
     option(NCNN_VULKAN_ONLINE_SPIRV "" ON)
     option(NCNN_BUILD_BENCHMARK "" OFF)
@@ -102,6 +103,7 @@ if(NOT USE_SYSTEM_NCNN)
     option(NCNN_BUILD_EXAMPLES "" OFF)
     option(NCNN_DISABLE_RTTI "" ON)
     option(NCNN_DISABLE_EXCEPTION "" ON)
+    option(NCNN_INT8 "" OFF)
 
     option(WITH_LAYER_absval "" OFF)
     option(WITH_LAYER_argmax "" OFF)
@@ -181,6 +183,9 @@ if(NOT USE_SYSTEM_NCNN)
     option(WITH_LAYER_groupnorm "" OFF)
     option(WITH_LAYER_layernorm "" OFF)
     option(WITH_LAYER_softplus "" OFF)
+    option(WITH_LAYER_gru "" OFF)
+    option(WITH_LAYER_multiheadattention "" OFF)
+    option(WITH_LAYER_gelu "" OFF)
 
     add_subdirectory(ncnn)
 endif()