pregcomp2.c: Avoid using incompatible pointer type #100
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See #98 (comment): Newer compilers may have
-Werror=incompatible-pointer-typesby default. Since pregcomp2.c does not dereference the result ofpregcomp2(), the result can be assigned tovoid *instead. There is already the regexp511.c configuration test to decide whether to useREGEXP *instead ofregexp *, but that test is run after pregcomp2.c.