Make the CVS version clone the libcurl version string, this is generated

by the maketgz script so in releases this is replaced by an actual string.

src/version.h

 #define CURL_NAME "curl"
-#define CURL_VERSION "7.10.8-pre5"
+#define CURL_VERSION LIBCURL_VERSION
 #define CURL_ID CURL_NAME " " CURL_VERSION " (" OS ") "