[all] use explicit void parameter lists

This makes it a compile-time error to call a function that semantically
takes no parameters with a nonzero number of arguments.

Previously, such code would still compile, but risk blowing up the stack
if a compiler chose to use something other than caller-cleanup calling
conventions.

common/src/platform/linux/crash.c

@@ -54,7 +54,7 @@ struct crash
 
 static struct crash crash = {0};
 
-static void load_symbols()
+static void load_symbols(void)
 {
   bfd_init();
   crash.fd = bfd_openr(crash.exe, NULL);
@@ -131,7 +131,7 @@ static bool lookup_address(bfd_vma pc, const char ** filename, const char ** fun
   return true;
 }
 
-static void cleanup()
+static void cleanup(void)
 {
   if (crash.syms)
     free(crash.syms);

common/src/platform/linux/ivshmem.c

@@ -82,7 +82,7 @@ static StringList ivshmemDeviceGetValues(struct Option * option)
   return sl;
 }
 
-void ivshmemOptionsInit()
+void ivshmemOptionsInit(void)
 {
   struct Option options[] =
   {

common/src/platform/linux/sysinfo.c

@@ -20,7 +20,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <unistd.h>
 #include <GL/glx.h>
 
-int sysinfo_gfx_max_multisample()
+int sysinfo_gfx_max_multisample(void)
 {
   Display * dpy = XOpenDisplay(NULL);
   if (!dpy)
@@ -64,7 +64,7 @@ int sysinfo_gfx_max_multisample()
   return maxSamples;
 }
 
-long sysinfo_getPageSize()
+long sysinfo_getPageSize(void)
 {
   return sysconf(_SC_PAGESIZE);
 }

common/src/platform/windows/ivshmem.c

@@ -33,7 +33,7 @@ struct IVSHMEMInfo
   HANDLE handle;
 };
 
-void ivshmemOptionsInit()
+void ivshmemOptionsInit(void)
 {
   static struct Option options[] = {
     {

common/src/platform/windows/sysinfo.c

@@ -19,13 +19,13 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 
 #include <windows.h>
 
-int sysinfo_gfx_max_multisample()
+int sysinfo_gfx_max_multisample(void)
 {
   //FIXME: Implement this
   return 4;
 }
 
-long sysinfo_getPageSize()
+long sysinfo_getPageSize(void)
 {
   SYSTEM_INFO si;
   GetSystemInfo(&si);

common/src/platform/windows/windebug.c

@@ -58,7 +58,7 @@ inline static BOOL CompareWindowsVersion(DWORD dwMajorVersion, DWORD dwMinorVers
   return VerifyVersionInfo(&ver, VER_MAJORVERSION | VER_MINORVERSION, dwlConditionMask);
 }
 
-bool IsWindows8()
+bool IsWindows8(void)
 {
   return
     (CompareWindowsVersion(6, 3) == TRUE) ||