[build] Configure library naming conventions for WebAssembly platforms

Use the same conventions used in wasi-libc and Emscripten

Author: kateinoigakukun

cmake/modules/SwiftConfigureSDK.cmake

@@ -304,11 +304,11 @@ macro(configure_sdk_unix name architectures)
     set(SWIFT_SDK_${prefix}_STATIC_LIBRARY_SUFFIX ".lib")
     set(SWIFT_SDK_${prefix}_IMPORT_LIBRARY_PREFIX "")
     set(SWIFT_SDK_${prefix}_IMPORT_LIBRARY_SUFFIX ".lib")
-  elseif("${prefix}" STREQUAL "WASI")
+  elseif("${prefix}" STREQUAL "WASI" OR "${prefix}" STREQUAL "EMSCRIPTEN")
     set(SWIFT_SDK_${prefix}_OBJECT_FORMAT "WASM")
-    set(SWIFT_SDK_${prefix}_SHARED_LIBRARY_PREFIX "")
-    set(SWIFT_SDK_${prefix}_SHARED_LIBRARY_SUFFIX ".wasm")
-    set(SWIFT_SDK_${prefix}_STATIC_LIBRARY_PREFIX "")
+    set(SWIFT_SDK_${prefix}_SHARED_LIBRARY_PREFIX "lib")
+    set(SWIFT_SDK_${prefix}_SHARED_LIBRARY_SUFFIX ".so")
+    set(SWIFT_SDK_${prefix}_STATIC_LIBRARY_PREFIX "lib")
     set(SWIFT_SDK_${prefix}_STATIC_LIBRARY_SUFFIX ".a")
     set(SWIFT_SDK_${prefix}_IMPORT_LIBRARY_PREFIX "")
     set(SWIFT_SDK_${prefix}_IMPORT_LIBRARY_SUFFIX "")