For master windows build dsa.h is now needed.

Reviewed-by: Matt Caswell <matt@openssl.org>

engines/e_capi.c

diff --git a/engines/e_capi.c b/engines/e_capi.c
index 8a19ed0..41257ad 100644
--- a/engines/e_capi.c
+++ b/engines/e_capi.c
@@ -64,6 +64,7 @@
 #include <openssl/buffer.h>
 #include <openssl/bn.h>
 #include <openssl/rsa.h>
+#include <openssl/dsa.h>
 
 #ifndef _WIN32_WINNT
 #define _WIN32_WINNT 0x0400