[Ur] [PATCH] Static link to libmhash when -static parameter given

[Karn Kallio]

The Ur/Web compiler links to the libmhash dynamic library independent of the
-static parameter being given to the compiler, which links only the liburweb 
statically.

This patch makes the Ur/Web compiler also link libmhash statically with the -
static flag.  The motivation is to have -static produce programs which can run 
on machines without a special Ur/Web installation ( considering libmhash as 
part of a Ur/Web installation because it is not likely to be found on many 
machines ). 

The goal is to use -static to produce executables which can be placed on 
shared hosting Linux servers with Apache CGI via FTP ... "bringing Ur to the 
world" 

The patch adds a configure flag --with-mhash-dir to let the Ur/Web compiler 
know how to find libmhash.a in order to pass it along to gcc.

I do not know if this patch will interact badly with the FFI mechanism of 
Ur/Web.

Note: after applying the patch I did $autoreconf -i to update the autotools 
build system.
 
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