re-implement the method for guranteeing the singleton instance on win32.

I found some crash issues that enventor couldn't catch the event.
Have no idea what kinds of the crashes but probably it'd out of the signal
handling.

So re-implement the way of supporting the locking file mechanism
to use the win32 basic File functionality that gurantee removing file
when Enventor is closed in normal or abnormal, either cases.

src/bin/main.c

@@ -7,7 +7,7 @@
 #include "common.h"
 
 #ifdef _WIN32
-#include <signal.h>
+#include <Windows.h>
 #endif
 
 typedef struct app_s
@@ -956,6 +956,15 @@ enventor_lock_create(void)
      }
 
    //Ok, this is an unique instance!
+#ifdef _WIN32
+   HANDLE handle = CreateFile(buf, GENERIC_READ, NULL, NULL, CREATE_NEW,
+                              FILE_FLAG_DELETE_ON_CLOSE, 0);
+   if (INVALID_HANDLE_VALUE == handle)
+     {
+        EINA_LOG_ERR("Failed to open file \"%s\"", buf);
+        return EINA_TRUE;
+     }
+#else
    FILE *fp = fopen(buf, "w");
    if (!fp)
      {
@@ -964,6 +973,7 @@ enventor_lock_create(void)
      }
    fputs("x", fp);
    fclose(fp);
+#endif
 
    own_lock = EINA_TRUE;
 
@@ -973,6 +983,7 @@ enventor_lock_create(void)
 static void
 enventor_lock_remove()
 {
+#ifndef _WIN32
    //You are not the owner of the lock.
    if (!own_lock) return;
 
@@ -1001,38 +1012,27 @@ enventor_lock_remove()
      }
 
    ecore_file_remove(buf);
-}
-
-#ifdef _WIN32
-static void
-crash_handler(int signal EINA_UNUSED)
-{
-   EINA_LOG_ERR("Eeeek! Eventor is terminated abnormally!");
-   enventor_lock_remove();
-}
-
-static void
-sigaction_setup(void)
-{
-   signal(SIGABRT, &crash_handler);
-   signal(SIGFPE, &crash_handler);
-   signal(SIGILL, &crash_handler);
-   signal(SIGINT, &crash_handler);
-   signal(SIGSEGV, &crash_handler);
-   signal(SIGTERM, &crash_handler);
-}
 #else
+   (void) 0;
+#endif
+}
+
 static void
 crash_handler(int x EINA_UNUSED, siginfo_t *info EINA_UNUSED,
               void *data EINA_UNUSED)
 {
+#ifndef _WIN32
    EINA_LOG_ERR("Eeeek! Eventor is terminated abnormally!");
    enventor_lock_remove();
+#else
+   (void) 0;
+#endif
 }
 
 static void
 sigaction_setup(void)
 {
+#ifndef _WIN32
    //Just in case, if you are debugging using gdb,
    //you can send signals like this. "handle SIGABRT pass"
    //Use this for remove the enventor lock.
@@ -1068,8 +1068,10 @@ sigaction_setup(void)
 
    //Interrupt from keyboard
    //sigaction(SIGINT, &action, NULL);
-}
+#else
+   (void) 0;
 #endif
+}
 
 static Eina_Bool
 init(app_data *ad, int argc, char **argv)