precompile_utils: Don't enqueue macro methods for pre-compilation

Despite disabling the runtime from compiling `macro` functions in
`gf.c`, the pre-compilation code was adding macro code anyway to
the workqueue.

Author: topolarity

src/precompile_utils.c

@@ -170,6 +170,10 @@ static void jl_compile_all_defs(jl_array_t *mis, int all)
     size_t i, l = jl_array_nrows(allmeths);
     for (i = 0; i < l; i++) {
         jl_method_t *m = (jl_method_t*)jl_array_ptr_ref(allmeths, i);
+        int is_macro_method = jl_symbol_name(m->name)[0] == '@';
+        if (is_macro_method)
+            continue; // Avoid inference / pre-compilation for macros
+
         if (jl_is_datatype(m->sig) && jl_isa_compileable_sig((jl_tupletype_t*)m->sig, jl_emptysvec, m)) {
             // method has a single compilable specialization, e.g. its definition
             // signature is concrete. in this case we can just hint it.