Added compile-vs-runtime library version checks

termkey.h.in

@@ -7,6 +7,9 @@
 #define TERMKEY_VERSION_MAJOR @@VERSION_MAJOR@@
 #define TERMKEY_VERSION_MINOR @@VERSION_MINOR@@
 
+#define TERMKEY_CHECK_VERSION \
+        termkey_check_version(TERMKEY_VERSION_MAJOR, TERMKEY_VERSION_MINOR)
+
 typedef enum {
   TERMKEY_SYM_UNKNOWN = -1,
   TERMKEY_SYM_NONE = 0,
@@ -128,6 +131,8 @@ enum {
   TERMKEY_FLAG_NOTERMIOS   = 1 << 4, // Do not make initial termios calls on construction
 };
 
+void termkey_check_version(int major, int minor);
+
 termkey_t *termkey_new(int fd, int flags);
 void       termkey_free(termkey_t *tk);
 void       termkey_destroy(termkey_t *tk);