Fix a few compiler warnings.

py/compile.c

@@ -1610,7 +1610,7 @@ void compile_try_except(compiler_t *comp, py_parse_node_t pn_body, int n_except,
 
         EMIT(pop_top);
 
-        int l3;
+        int l3 = 0;
         if (qstr_exception_local != 0) {
             l3 = comp_next_label(comp);
             EMIT(setup_finally, l3);

stm/Makefile

@@ -148,7 +148,7 @@ $(BUILD)/%.o: $(CC3KSRC)/%.c
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 $(BUILD)/%.o: $(PYSRC)/%.s
-	$(AS) -c -o $@ $<
+	$(AS) -o $@ $<
 
 $(BUILD)/%.o: $(PYSRC)/%.c mpyconfig.h
 	$(CC) $(CFLAGS) -c -o $@ $<

unix/Makefile

@@ -50,7 +50,7 @@ $(BUILD)/%.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 $(BUILD)/%.o: $(PYSRC)/%.s
-	$(AS) -c -o $@ $<
+	$(AS) -o $@ $<
 
 $(BUILD)/%.o: $(PYSRC)/%.c mpyconfig.h
 	$(CC) $(CFLAGS) -c -o $@ $<