Solaris 8,9, and 10, x86 and sparc

configuring with '--with-ssl-engine' gives an error:

checking for OpenSSL ENGINE support... configure: error: OpenSSL ENGINE support not found


Cause:
configure.ac lines 1916 onward state:

                AC_TRY_COMPILE(
                        [ #include <openssl/engine.h>],
                        [
int main(void){ENGINE_load_builtin_engines();ENGINE_register_all_complete();}
                        ],
                        [ AC_MSG_RESULT(yes)
                          AC_DEFINE(USE_OPENSSL_ENGINE, 1,
                             [Enable OpenSSL engine support])
                        ],
                        [ AC_MSG_ERROR(OpenSSL ENGINE support not found)]
                )


This generates code in configure lines 17887 onward:

  int
  main ()
  {
  
  int main(void){ENGINE_load_builtin_engines();ENGINE_register_all_complet        e();}
  
    ;
    return 0;
  }


which the Sun Studio compiler doesn't regard as valid C: it's
declaring a function 'main()' inside a function 'main()', and
terminates with an error.

gcc doesn't seem to mind compiling this code, but the Sun Studio
compiler isn't having it.


Fix:
configure.ac, line 1919

Lose the leading "int main(void){" and the trailing "}"