toolchain: musl support is no longer experimental

Our musl support has now been around for quite some time, numerous
packages have been fixed (although admittedly not all). It's time to no
longer call our musl support "experimental": things are now expected to
be working with musl just like with the other two C libraries we
support.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/toolchain-buildroot/Config.in

@@ -67,7 +67,7 @@ comment "(e)glibc only available with shared lib support"
 	depends on BR2_STATIC_LIBS
 
 config BR2_TOOLCHAIN_BUILDROOT_MUSL
-	bool "musl (experimental)"
+	bool "musl"
 	depends on BR2_aarch64 || BR2_arm || BR2_armeb || BR2_i386 || \
 		BR2_microblaze || BR2_mips || BR2_mipsel || BR2_powerpc || \
 		BR2_sh || BR2_x86_64

toolchain/toolchain-external/Config.in

@@ -562,7 +562,7 @@ config BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_AARCH64
 	  3.16.2.
 
 config BR2_TOOLCHAIN_EXTERNAL_MUSL_CROSS
-	bool "Musl 1.1.12 toolchain (experimental)"
+	bool "Musl 1.1.12 toolchain"
 	depends on (BR2_arm && BR2_ARM_EABI) || \
 		(BR2_arm && BR2_ARM_EABIHF && !BR2_ARM_CPU_ARMV4) || \
 		(BR2_armeb && BR2_ARM_EABI) || BR2_i386 || \
@@ -914,7 +914,7 @@ comment "(e)glibc only available with shared lib support"
 	depends on BR2_STATIC_LIBS
 
 config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL
-	bool "musl (experimental)"
+	bool "musl"
 	select BR2_TOOLCHAIN_EXTERNAL_MUSL
 	help
 	  Select this option if your external toolchain uses the