bistromathic doesn't build

[Horst von Brand]

Bison 3.5.90.41-3b05-dirty (built from git, *no* changes, dunno where the 
"dirty" comes from), on Fedora 31, x86_64.

examples/c/bistromathic build fails, because LC_ALL isn't defined (missing 
<locale.h>), link references a non-existing/unneeded library -lintl (perhaps 
needed for other environments?) and is missing the C math library (-lm). The 
attached patch fixes all those.
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                    Fono: +56 32 2654431
Universidad Tecnica Federico Santa Maria             +56 32 2654239
Casilla 110-V, Valparaiso, Chile 2340000       Fax:  +56 32 2797513

patch
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