package: add support for musl in tuple

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

package/Makefile.in

@@ -47,6 +47,8 @@ endif
 
 ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
 LIBC=uclibc
+else ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
+LIBC=musl
 else
 LIBC=gnu
 endif