Remove vendored dlmalloc as unused

WASI-libc from which `dlmalloc` was vendored is already included in latest Swift SDKs for Wasm.

Author: MaxDesiatov

Guest/Package.swift

@@ -15,63 +15,25 @@
 
 import PackageDescription
 
-let embeddedSwiftSettings: [SwiftSetting] = [
-    .enableExperimentalFeature("Embedded"),
-    .enableExperimentalFeature("Extern"),
-    .interoperabilityMode(.Cxx),
-    .unsafeFlags(["-wmo", "-disable-cmo", "-Xfrontend", "-gnone", "-Xfrontend", "-disable-stack-protector"]),
-]
-
-let embeddedCSettings: [CSetting] = [
-    .unsafeFlags(["-fdeclspec"]),
-]
-
-let linkerSettings: [LinkerSetting] = [
-    .unsafeFlags([
-        "-Xclang-linker", "-nostdlib",
-        "-Xlinker", "--no-entry",
-    ]),
-]
-
-let libcSettings: [CSetting] = [
-    .define("LACKS_TIME_H"),
-    .define("LACKS_SYS_TYPES_H"),
-    .define("LACKS_STDLIB_H"),
-    .define("LACKS_STRING_H"),
-    .define("LACKS_SYS_MMAN_H"),
-    .define("LACKS_FCNTL_H"),
-    .define("NO_MALLOC_STATS", to: "1"),
-    .define("__wasilibc_unmodified_upstream"),
-]
-
 let package = Package(
     name: "Guest",
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
         // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Plotter",
-            dependencies: ["dlmalloc"],
-            cSettings: embeddedCSettings,
-            swiftSettings: embeddedSwiftSettings,
-            linkerSettings: linkerSettings
+            swiftSettings: [.enableExperimentalFeature("Extern")]
         ),
         .target(name: "VultDSP"),
-        .target(
-            name: "dlmalloc",
-            cSettings: libcSettings
-        ),
     ]
 )
 
 for module in ["Kick", "HiHat", "Bass", "Mix"] {
     package.targets.append(
         .executableTarget(
             name: module,
-            dependencies: ["VultDSP", "dlmalloc"],
-            cSettings: embeddedCSettings,
-            swiftSettings: embeddedSwiftSettings,
-            linkerSettings: linkerSettings
+            dependencies: ["VultDSP"],
+            swiftSettings: [.interoperabilityMode(.Cxx), .enableExperimentalFeature("Extern")]
         )
     )
 }

LICENSE-vendored.md

@@ -1,24 +1,3 @@
-# WASI libc
-
-Code in `Sources/dlmalloc` directory is derived from WASI libc: https://github.com/WebAssembly/wasi-libc
-
-wasi-libc as a whole is multi-licensed under the
-Apache License v2.0 with LLVM Exceptions, the Apache License v2.0, and
-the MIT License. See the LICENSE-APACHE-LLVM, LICENSE-APACHE and LICENSE-MIT
-files, respectively, for details.
-
-Portions of this software are derived from third-party works covered by
-their own licenses:
-
-dlmalloc/                     - CC0; see the notice in malloc.c for details
-emmalloc/                     - MIT; see the notice in emmalloc.c for details
-libc-bottom-half/cloudlibc/   - BSD-2-Clause; see the LICENSE file for details
-libc-top-half/musl/           - MIT; see the COPYRIGHT file for details
-
-wasi-libc's changes to these files are multi-licensed under the
-Apache License v2.0 with LLVM Exceptions, the Apache License v2.0,
-the MIT License, and the original licenses of the third-party works.
-
 # WavAudioEncoder.js
 
 `.wav` format encoding implementation is derived from WavAudioEncoder.js library https://github.com/higuma/wav-audio-encoder-js and is licensed as following:
@@ -69,4 +48,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.