malloc: fix musl build

pkg/common/malloc/c_allocator_linux.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build cgo
+//go:build cgo && !musl
 
 package malloc
 

pkg/common/malloc/c_allocator_linux_musl.go

@@ -0,0 +1,21 @@
+// Copyright 2024 Matrix Origin
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build cgo && musl
+
+package malloc
+
+func returnMallocMemoryToOS() {
+	// not supported by musl
+}