Don't force extension_module to build as a shared library by default

Other targets seem to just use whatever the default configuration is. Make this one work the same.


ghstack-source-id: c2b7580
ghstack-comment-id: 3046953486
Pull-Request-resolved: #12257

Author: swolchok

extension/module/CMakeLists.txt

@@ -25,7 +25,7 @@ if(CMAKE_TOOLCHAIN_IOS
   # duplicated registration when using shared lib
   add_library(extension_module STATIC ${_extension_module__srcs})
 else()
-  add_library(extension_module SHARED ${_extension_module__srcs})
+  add_library(extension_module ${_extension_module__srcs})
 endif()
 target_link_libraries(extension_module PRIVATE executorch_core extension_data_loader extension_flat_tensor)
 target_include_directories(extension_module PUBLIC ${EXECUTORCH_ROOT}/..)