Include stdbool.h in NK_C_API.h

NK_C_API.h uses the type bool although it is not defined in standard C.
Since C99, the header stdbool.h provides this type, so this patch
includes it in NK_C_API.h to make it valid C code.  (Note that the API
already required C99 for the "//"-style comments.)

1 files changed, 1 insertions, 0 deletions

diff --git a/NK_C_API.h b/NK_C_API.h
index 01290d8..a4fb088 100644
--- a/NK_C_API.h
+++ b/NK_C_API.h
@@ -22,6 +22,7 @@
 #ifndef LIBNITROKEY_NK_C_API_H
 #define LIBNITROKEY_NK_C_API_H
 
+#include <stdbool.h>
 #include <stdint.h>
 
 #ifdef _MSC_VER