[PR PATCH] README.md: update instructions of building for other libc

[Chocimier <Chocimier@users.noreply.github.com>]

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There is a new pull request by Chocimier against master on the void-packages repository

https://github.com/Chocimier/void-packages-org readme-native-musl
https://github.com/void-linux/void-packages/pull/25100

README.md: update instructions of building for other libc
base-chroot-musl is irrelevant since some time.

@pullmoll: Do new instruction miss anything?

A patch file from https://github.com/void-linux/void-packages/pull/25100.patch is attached

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From 772e3657e5bf3b29bdecd66044602510f6a96636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Piotr=20W=C3=B3jcik?= <chocimier@tlen.pl>
Date: Fri, 25 Sep 2020 21:27:48 +0200
Subject: [PATCH] README.md: update instructions of building for other libc

---
 README.md | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index fe85e3f20eb..dfa741c6daf 100644
--- a/README.md
+++ b/README.md
@@ -484,15 +484,8 @@ The second mode (native) needs a new x86 `masterdir`:
 <a name="building-for-musl"></a>
 ### Building packages natively for the musl C library
 
-A native build environment is required to be able to cross compile the bootstrap packages for the musl C library; this is accomplished by installing them via `binary-bootstrap`:
-
-    $ ./xbps-src binary-bootstrap
-
-Now cross compile `base-chroot-musl` for your native architecture:
-
-    $ ./xbps-src -a x86_64-musl pkg base-chroot-musl
-
-Wait until all packages are built and when ready, prepare a new masterdir with the musl packages:
+Canonical way of building packages for same architecture but different C library is through dedicated masterdir.
+To build for x86_64-musl on glibc x86_64 system, prepare a new masterdir with the musl packages:
 
     $ ./xbps-src -m masterdir-x86_64-musl binary-bootstrap x86_64-musl