Remove opaque typedef from UnityFixture struct, as done in core Unity

extras/fixture/src/unity_fixture.c

@@ -9,7 +9,7 @@
 #include "unity_fixture.h"
 #include "unity_internals.h"
 
-UNITY_FIXTURE_T UnityFixture;
+struct _UnityFixture UnityFixture;
 
 //If you decide to use the function pointer approach.
 //Build with -D UNITY_OUTPUT_CHAR=outputChar and include <stdio.h>

extras/fixture/src/unity_fixture_internals.h

@@ -8,13 +8,13 @@
 #ifndef UNITY_FIXTURE_INTERNALS_H_
 #define UNITY_FIXTURE_INTERNALS_H_
 
-typedef struct _UNITY_FIXTURE_T
+struct _UnityFixture
 {
     int Verbose;
     unsigned int RepeatCount;
     const char* NameFilter;
     const char* GroupFilter;
-} UNITY_FIXTURE_T;
+};
 
 typedef void unityfunction(void);
 void UnityTestRunner(unityfunction* setup,

extras/fixture/test/unity_fixture_Test.c

@@ -10,7 +10,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-extern UNITY_FIXTURE_T UnityFixture;
+extern struct _UnityFixture UnityFixture;
 
 TEST_GROUP(UnityFixture);