swtpm: Include opensslv.h to get OPENSSL_VERSION_NUMBER

Include openssl/opensslv.h to avoid the following error on Ubuntu:

fips.c: In function 'fips_mode_enabled':
fips.c:61:16: error: implicit declaration of function 'EVP_default_properties_is_fips_enabled' [-Werror=implicit-function-declaration]
   61 |     int mode = EVP_default_properties_is_fips_enabled(NULL);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Resolves: https://github.com/stefanberger/libtpms/issues/345
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
diff --git a/src/swtpm/fips.c b/src/swtpm/fips.c
index de149b3..5585371 100644
--- a/src/swtpm/fips.c
+++ b/src/swtpm/fips.c
@@ -40,6 +40,8 @@
 #include "fips.h"
 #include "logging.h"
 
+#include <openssl/opensslv.h>
+
 #if defined(HAVE_OPENSSL_FIPS_H)
 # include <openssl/fips.h>
 #elif defined(HAVE_OPENSSL_FIPS_MODE_SET_API)