AP_Common: include integer version of hash in FWVersion struct

libraries/AP_Common/AP_FWVersion.h

@@ -28,6 +28,7 @@ public:
     const uint32_t os_sw_version;
     const char *fw_string;
     const char *fw_hash_str;
+    const uint32_t fw_hash;
     const char *fw_string_original;
     const char *fw_short_string;
     const char *middleware_name;

libraries/AP_Common/AP_FWVersionDefine.h

@@ -59,6 +59,11 @@ const AP_FWVersion AP_FWVersion::fwver{
 #else
     .fw_string = ACTIVE_FWSTR " (" GIT_VERSION ")",
     .fw_hash_str = GIT_VERSION,
+#endif
+#ifndef GIT_VERSION_INT
+    .fw_hash = 0,
+#else
+   .fw_hash = GIT_VERSION_INT,
 #endif
     .fw_string_original = ORIGINAL_FWSTR,
     .fw_short_string = ACTIVE_FWSTR,