Enable "missing prototypes" warning for gcc, clang

Missing prototypes for exported functions cause a really huge issue on
Windows.  Enabling the "missing prototypes" warning makes it much easier
to catch this problem.  Naturally, any warnings caused by this have been
fixed.

Signed-off-by: Erik Boasson <eb@ilities.com>

src/mpt/tests/basic/procs/hello.c

@@ -5,7 +5,6 @@
 #include "mpt/mpt.h"
 
 #include "dds/dds.h"
-#include "helloworlddata.h"
 
 #include "dds/ddsrt/time.h"
 #include "dds/ddsrt/strtol.h"
@@ -14,6 +13,8 @@
 #include "dds/ddsrt/cdtors.h"
 #include "dds/ddsrt/sync.h"
 
+#include "hello.h"
+#include "helloworlddata.h"
 
 /* An array of one message (aka sample in dds terms) will be used. */
 #define MAX_SAMPLES 1

src/mpt/tests/qos/procs/ppud.c

@@ -14,7 +14,6 @@
 #include <assert.h>
 
 #include "mpt/mpt.h"
-#include "rwdata.h"
 
 #include "dds/dds.h"
 
@@ -23,6 +22,9 @@
 #include "dds/ddsrt/sockets.h"
 #include "dds/ddsrt/heap.h"
 
+#include "ppud.h"
+#include "rwdata.h"
+
 void ppud_init (void) { }
 void ppud_fini (void) { }
 

src/mpt/tests/qos/procs/rw.c

@@ -16,7 +16,6 @@
 #include "mpt/mpt.h"
 
 #include "dds/dds.h"
-#include "rwdata.h"
 
 #include "dds/ddsrt/time.h"
 #include "dds/ddsrt/process.h"
@@ -25,6 +24,9 @@
 
 #include "dds/ddsi/q_xqos.h"
 
+#include "rwdata.h"
+#include "rw.h"
+
 #define NPUB 10
 #define NWR_PUB 2