win32ipcutils: Add missing include

We are using std::isspace() with one parameter. That function is defined
in the cctype header.

```
win32ipcutils.cpp(34): error C2672: 'std::isspace': no matching overloaded function found
win32ipcutils.cpp(34): error C2780: 'bool std::isspace(_Elem,const std::locale &)': expects 2 arguments - 1 provided
```

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3936>

diff --git a/subprojects/gst-plugins-bad/sys/win32ipc/protocol/win32ipcutils.cpp b/subprojects/gst-plugins-bad/sys/win32ipc/protocol/win32ipcutils.cpp
index 0982382..cc467cc 100644 (file)
--- a/subprojects/gst-plugins-bad/sys/win32ipc/protocol/win32ipcutils.cpp
+++ b/subprojects/gst-plugins-bad/sys/win32ipc/protocol/win32ipcutils.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "win32ipcutils.h"
+#include <cctype>
 #include <string>
 #include <locale>
 #include <codecvt>