main: remove -cflags and -ldflags flags

These are unnecessary now that they are supported in CGo.

compileopts/config.go

@@ -184,7 +184,7 @@ func (c *Config) AutomaticStackSize() bool {
 // CFlags returns the flags to pass to the C compiler. This is necessary for CGo
 // preprocessing.
 func (c *Config) CFlags() []string {
-	cflags := append([]string{}, c.Options.CFlags...)
+	var cflags []string
 	for _, flag := range c.Target.CFlags {
 		cflags = append(cflags, strings.ReplaceAll(flag, "{root}", goenv.Get("TINYGOROOT")))
 	}
@@ -205,7 +205,7 @@ func (c *Config) CFlags() []string {
 func (c *Config) LDFlags() []string {
 	root := goenv.Get("TINYGOROOT")
 	// Merge and adjust LDFlags.
-	ldflags := append([]string{}, c.Options.LDFlags...)
+	var ldflags []string
 	for _, flag := range c.Target.LDFlags {
 		ldflags = append(ldflags, strings.ReplaceAll(flag, "{root}", root))
 	}

compileopts/options.go

@@ -28,8 +28,6 @@ type Options struct {
 	Debug         bool
 	PrintSizes    string
 	PrintStacks   bool
-	CFlags        []string
-	LDFlags       []string
 	Tags          string
 	WasmAbi       string
 	TestConfig    TestConfig

main.go

@@ -859,8 +859,6 @@ func main() {
 	ocdOutput := flag.Bool("ocd-output", false, "print OCD daemon output during debug")
 	port := flag.String("port", "", "flash port (can specify multiple candidates separated by commas)")
 	programmer := flag.String("programmer", "", "which hardware programmer to use")
-	cFlags := flag.String("cflags", "", "additional cflags for compiler")
-	ldFlags := flag.String("ldflags", "", "additional ldflags for linker")
 	wasmAbi := flag.String("wasm-abi", "", "WebAssembly ABI conventions: js (no i64 params) or generic")
 
 	var flagJSON, flagDeps *bool
@@ -908,14 +906,6 @@ func main() {
 		Programmer:    *programmer,
 	}
 
-	if *cFlags != "" {
-		options.CFlags = strings.Split(*cFlags, " ")
-	}
-
-	if *ldFlags != "" {
-		options.LDFlags = strings.Split(*ldFlags, " ")
-	}
-
 	os.Setenv("CC", "clang -target="+*target)
 
 	err := options.Verify()