dante: fix runtime on musl.

musl implements the sched_{set,get}scheduler functions as stubs.
Unfortunately, dante fails if the functions are available but return an
error, which is always the case for musl. Force it to think setscheduler
isn't available (var appropriated from Alpine).

Fixes #28180

srcpkgs/dante/template

@@ -1,7 +1,7 @@
 # Template file for 'dante'
 pkgname=dante
 version=1.4.2
-revision=3
+revision=4
 build_style=gnu-configure
 hostmakedepends="tar automake libtool"
 short_desc="SOCKS server and client"
@@ -13,6 +13,8 @@ checksum=4c97cff23e5c9b00ca1ec8a95ab22972813921d7fbf60fc453e3e06382fc38a7
 
 if [ "$XBPS_TARGET_LIBC" = "glibc" ]; then
 	configure_args="--with-libc=libc.so.6"
+else
+	configure_args="ac_cv_func_sched_setscheduler=no"
 fi
 
 pre_configure() {