bug#34054: Error in compilation of pcresearch if we have no pcre library

[Paul Eggert]

Jim Meyering wrote:
> Technically, we could fix it by adding more ifdefs, but I think it
> would not be worthwhile to accommodate this use case.

I looked into this and discovered that fixing this can actually simplify the 
source code by removing the need for the "We can't get here" glitch in 
pcresearch.c. Although the fix does add complexity elsewhere so that the total 
number of ifdefs and ifs remains the same, overall grep gets a bit simpler and 
cleaner with the fix so I took the liberty of installing it (attached).

0001-grep-simplify-pcresearch.c-ifdefs.patch
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