Fix old-style definition warning for xf86OSInputThreadInit()

../hw/xfree86/os-support/stub/stub_init.c: In function ‘xf86OSInputThreadInit’:
../hw/xfree86/os-support/stub/stub_init.c:29:1: warning: old-style function definition [-Wold-style-definition]

(cherry picked from commit 7c266caf)

hw/xfree86/os-support/bsd/bsd_init.c

@@ -663,7 +663,7 @@ xf86UseMsg()
 }
 
 void
-xf86OSInputThreadInit()
+xf86OSInputThreadInit(void)
 {
     return;
 }

hw/xfree86/os-support/hurd/hurd_init.c

@@ -89,7 +89,7 @@ xf86CloseConsole()
 }
 
 void
-xf86OSInputThreadInit()
+xf86OSInputThreadInit(void)
 {
     return;
 }

hw/xfree86/os-support/linux/lnx_init.c

@@ -399,7 +399,7 @@ xf86UseMsg(void)
 }
 
 void
-xf86OSInputThreadInit()
+xf86OSInputThreadInit(void)
 {
     return;
 }

hw/xfree86/os-support/solaris/sun_vid.c

@@ -74,7 +74,7 @@ xf86OSInitVidMem(VidMemInfoPtr pVidMem)
 /***************************************************************************/
 
 void
-xf86OSInputThreadInit()
+xf86OSInputThreadInit(void)
 {
     /*
      * Need to enable in input thread as well, as Solaris kernel tracks

hw/xfree86/os-support/stub/stub_init.c

@@ -26,7 +26,7 @@ xf86UseMsg(void)
 }
 
 void
-xf86OSInputThreadInit()
+xf86OSInputThreadInit(void)
 {
     return;
 }