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Add missing 'static' on dputs().

This fixes a build failure due to -Wmissing-prototypes if you build
with -DDEBUGGING.

--- a/gtk.c

+++ b/gtk.c

@@ -88,7 +88,7 @@

 #ifdef DEBUGGING

 static FILE *debug_fp = NULL;

-void dputs(const char *buf)

+static void dputs(const char *buf)

 {

     if (!debug_fp) {

         debug_fp = fopen("debug.log", "w");

--- a/windows.c

+++ b/windows.c

@@ -73,7 +73,7 @@

 static HANDLE debug_hdl = INVALID_HANDLE_VALUE;

 static int debug_got_console = 0;

-void dputs(char *buf)

+static void dputs(char *buf)

 {

     /*DWORD dw;