Incorrect check for availability of LoadLibrary function

I am trying to build softHSM (svn rev. 5288) on Windows XP with MinGW and I am facing a little problem with autoconfiguration and acx_dlopen.m4 macro.

When I run..

./configure --with-botan=c:/botan --with-sqlite3=c:/sqlite3

..it always ends with message:

checking for dlopen... no
checking for dlopen in -ldl... no
checking for LoadLibrary... no
configure: error: No dynamic library loading support

I am pretty sure that LoadLibrary is available on this system because I use it in other projects.

I am no m4 expert so I've used only simple workaround to pass this test (attached as a patch). If you can come up with better solution I will gladly test it.