clean: remove linux-*

Makefile

@@ -36,7 +36,7 @@ SRC_DIRS = gcc-$(GCC_VER) binutils-$(BINUTILS_VER) musl-$(MUSL_VER) \
 all:
 
 clean:
-	rm -rf gcc-* binutils-* musl-* gmp-* mpc-* mpfr-* build-*
+	rm -rf gcc-* binutils-* musl-* gmp-* mpc-* mpfr-* build-* linux-*
 
 distclean: clean
 	rm -rf sources