don't mangle macros with spaces at the beginning

Author: bgentry

netrc/examples/good.netrc

@@ -9,7 +9,7 @@ macdef allput
 put src/*
 
 macdef allput2
-put src/*
+  put src/*
 put src2/*
 
 machine ray login demo password mypassword

netrc/netrc.go

@@ -230,7 +230,7 @@ func parse(r io.Reader, pos int) (*Netrc, error) {
 
 		if currentMacro != nil && bytes.Contains(rawb, []byte{'\n', '\n'}) {
 			// if macro rawvalue + rawb would contain \n\n, then macro def is over
-			currentMacro.value = strings.TrimSpace(string(currentMacro.rawvalue))
+			currentMacro.value = string(bytes.TrimLeft(currentMacro.rawvalue, "\r\n"))
 			nrc.macros[currentMacro.macroName] = currentMacro.value
 			nrc.tokens = append(nrc.tokens, currentMacro)
 			currentMacro = nil

netrc/netrc_test.go

@@ -19,7 +19,7 @@ var expectedMachines = []*Machine{
 }
 var expectedMacros = Macros{
 	"allput":  "put src/*",
-	"allput2": "put src/*\nput src2/*",
+	"allput2": "  put src/*\nput src2/*",
 }
 
 func eqMachine(a *Machine, b *Machine) bool {