We have several AC_TRY_RUN's in the configure/m4 stuff,
which obviously breaks crosscompiling.
This changeset contain fixies for S-Lang library. First try to search
library via 'pkg-config slang' and then try to go in old search way.
Macro AC_TRY_RUN() now replaced by AC_RUN_IFELSE()
Also, next changes was made:
* Removed AC_TRY_RUN() from gmodule checking code.
* More accuracy in grepping of SLANG_VERSION defined constant
* avoid autoconf error 'suspicious presence of an AC_DEFINE in the second argument, where no actions should be taken'
Signed-off-by: Slava Zanko <slavazanko@gmail.com>
