Reduced executable size on Linux

src/macho/MachO.go

@@ -19,8 +19,7 @@ type MachO struct {
 
 // Write writes the Mach-O format to the given writer.
 func Write(writer io.WriteSeeker, b *build.Build, codeBytes []byte, dataBytes []byte) {
-	x := exe.New(HeaderEnd, b.FileAlign(), b.MemoryAlign())
-	x.InitSections(codeBytes, dataBytes)
+	x := exe.New(HeaderEnd, b.FileAlign(), b.MemoryAlign(), b.Congruent(), codeBytes, dataBytes)
 	code := x.Sections[0]
 	data := x.Sections[1]
 	arch, microArch := Arch(b.Arch)