libsemanage: include paired header for prototypes

context_record.c:11:13: warning: no previous prototype for ‘semanage_context_get_user’ [-Wmissing-prototypes]
       11 | const char *semanage_context_get_user(const semanage_context_t * con)
          |             ^~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>

libsemanage/src/context_record.c

@@ -7,6 +7,8 @@ typedef sepol_context_t semanage_context_t;
 
 #define _SEMANAGE_CONTEXT_DEFINED_
 
+#include <semanage/context_record.h>
+
 /* User */
 const char *semanage_context_get_user(const semanage_context_t * con)
 {