musl: fixed to create a libc.so symlink to avoid libtool's attempt linking shared libs against libc.a in certain cases

base/musl/musl.conf

@@ -35,6 +35,10 @@ if [ "$SDECFG_LIBC" == "musl" ]; then
 	var_append extraconfopt ' ' "--disable-gcc-wrapper"
 
 	if ! atstage toolchain; then
+		# create a libc.so symlink to avoid libtool's attempt linking
+		# shared libs against libc.a in certain cases
+		hook_add postinstall 5 'ln -vsf $( relative_path $root$slibdir/libc.so $root/$prefix$libdir/libc.so ) $root/$prefix$libdir/libc.so'
+
 		# create a symlink from ld-musl-$musl_arch.so to ldd
 		# if the dynlinker was started as "ldd" it will print
 		# DSO information