fix: symbol not found when building in baremental environment

runtime/internal/lib/internal/syscall/unix/fcntl_baremental.go

@@ -0,0 +1,15 @@
+//go:build baremental
+
+package unix
+
+import (
+	_ "unsafe"
+)
+
+func Fcntl(fd int, cmd int, arg int) (int, error) {
+	return 0, nil
+}
+
+func fcntl(fd int, cmd int, arg int) (int, error) {
+	return 0, nil
+}

runtime/internal/lib/internal/syscall/unix/fcntl_unix.go

@@ -1,3 +1,5 @@
+//go:build !baremental
+
 package unix
 
 import (