musl: refresh patches

Signed-off-by: Koen Vandeputte <[email protected]>

toolchain/musl/patches/300-relative.patch

@@ -1,6 +1,6 @@
 --- a/Makefile
 +++ b/Makefile
-@@ -215,7 +215,7 @@ $(DESTDIR)$(includedir)/%: $(srcdir)/inc
+@@ -221,7 +221,7 @@ $(DESTDIR)$(includedir)/%: $(srcdir)/inc
  	$(INSTALL) -D -m 644 $< $@
  
  $(DESTDIR)$(LDSO_PATHNAME): $(DESTDIR)$(libdir)/libc.so