Add rustup toolchain add nightly... command.

Author: brocaar

Makefile

@@ -23,12 +23,12 @@ build-armv7-unknown-linux-musleabihf:
 
 build-mips-unknown-linux-musl:
 	# mips is a tier-3 target.
-	# rustup toolchain add nightly-2024-02-18-x86_64-unknown-linux-gnu
+	rustup toolchain add nightly-2024-02-18-x86_64-unknown-linux-gnu
 	cross +nightly-2024-02-18 build -Z build-std=panic_abort,std --target mips-unknown-linux-musl --release --no-default-features --features semtech_udp
 
 build-mipsel-unknown-linux-musl:
 	# mipsel is a tier-3 target.
-	# rustup toolchain add nightly-2024-02-18-x86_64-unknown-linux-gnu
+	rustup toolchain add nightly-2024-02-18-x86_64-unknown-linux-gnu
 	cross +nightly-2024-02-18 build -Z build-std=panic_abort,std --target mipsel-unknown-linux-musl --release --no-default-features --features semtech_udp
 
 # Build distributable binaries for all targets.