eolian: fix tests fallout from the latest changes

src/tests/eolian/data/nmsp2_class1.eo

@@ -1,3 +1,3 @@
-class nmsp2.class1
+mixin nmsp2.class1
 {
 }

src/tests/eolian/data/no_nmsp.eo

@@ -1,4 +1,4 @@
-class no_nmsp
+mixin no_nmsp
 {
    methods {
       foo {

src/tests/eolian/data/parts.eo

@@ -1,7 +1,6 @@
-class Parts extends Override implements Base {
+class Parts extends Override {
    parts {
       part1: Override; [[Part 1]]
-      part2: Base; [[Part 2]]
-      part3: Parts; [[Part 3]]
+      part2: Parts; [[Part 2]]
    }
 }

src/tests/eolian/eolian_parsing.c

@@ -1516,7 +1516,7 @@ EFL_START_TEST(eolian_parts)
    int i = 0;
 
    static const char *part_classes[] = {
-      "Override", "Base", "Parts"
+      "Override", "Parts"
    };
 
    Eolian_State *eos = eolian_state_new();