lookup.c: maybe_discarded_sym() add __pfx_ pattern

Linux-6.4 generates __pfx_{func} symbols for each function symbol {func},
however, vmlinux symtab will not contain these symbols, which will cause
error when matching local symbols for changed objects.

Signed-off-by: hubin <[email protected]>

kpatch-build/lookup.c

@@ -83,6 +83,7 @@ static bool maybe_discarded_sym(const char *name)
 	    !strncmp(name, "__brk_reservation_fn_", 21) ||
 	    !strncmp(name, "__func_stack_frame_non_standard_", 32) ||
 	    strstr(name, "__addressable_") ||
+	    strstr(name, "__pfx_") ||
 	    strstr(name, "__UNIQUE_ID_") ||
 	    !strncmp(name, ".L.str", 6) ||
 	    is_ubsan_sec(name))