cleanup library and some basic tests. Includes, add guards to includes

library/memory_buffer_alloc.c

@@ -33,8 +33,13 @@
 #include <string.h>
 
 #if defined(POLARSSL_MEMORY_DEBUG)
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
 #include <stdio.h>
-#endif
+#define polarssl_fprintf fprintf
+#endif /* POLARSSL_PLATFORM_C */
+#endif /* POLARSSL_MEMORY_DEBUG */
 #if defined(POLARSSL_MEMORY_BACKTRACE)
 #include <execinfo.h>
 #endif
@@ -43,12 +48,6 @@
 #include "polarssl/threading.h"
 #endif
 
-#if defined(POLARSSL_PLATFORM_C)
-#include "polarssl/platform.h"
-#else
-#define polarssl_fprintf fprintf
-#endif
-
 /* Implementation that should never be optimized out by the compiler */
 static void polarssl_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;