pipewire: add missing stdbool.h include to version.h.in

The header file only works when included in a file where stdbool.h was already included otherwise.

src/pipewire/version.h.in

@@ -11,6 +11,8 @@
 extern "C" {
 #endif
 
+#include <stdbool.h>
+
 /** Return the version of the header files. Keep in mind that this is
 a macro and not a function, so it is impossible to get the pointer of
 it. */