Add LD_PLUGIN_V2 and use it for MUSL.

commit_hash:b66e8aea0778dda478d029d881f0dbe754ac8bd4

Author: pg

build/ymake.core.conf

@@ -3156,6 +3156,11 @@ macro LD_PLUGIN(name) {
     SRCS(GLOBAL $name.pyplugin)
 }
 
+macro LD_PLUGIN_V2(Name) {
+    .CMD=$COPY_CMD ${context=TEXT;input:Name} ${noauto;output;global;suf=.pyplugin:Name}
+    .SEM=_SEM_IGNORED
+}
+
 USE_FLANG=no
 
 when ($USE_FLANG == "yes") {