xapp_xload: fix musl build

xapp_xload tries to include protocols/rwhod.h, which isn't available on
musl. Fortunately, the package also has stub code that can be enabled
with -DRLOADSTUB (this is done e.g. on Cygwin).

This should probably be detected in configure, but that's a lot more
work.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xapp_xload/xapp_xload.mk

@@ -11,4 +11,9 @@ XAPP_XLOAD_LICENSE = MIT
 XAPP_XLOAD_LICENSE_FILES = COPYING
 XAPP_XLOAD_DEPENDENCIES = xlib_libXaw
 
+ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
+# musl doesn't have rwhod.h, but xload can replace it with stubs
+XAPP_XLOAD_CONF_OPTS += CFLAGS="$(TARGET_CFLAGS) -DRLOADSTUB"
+endif
+
 $(eval $(autotools-package))