grepc.1: Add manual page

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

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+.TH GREPC 1 2022-05-09 grepc "User commands"
+.SH NAME
+grepc \- find C declarations and definitions in source code
+.SH SYNOPSIS
+.B grepc
+.I identifier
+.SH DESCRIPTION
+.MR grepc 1
+searches for all C declarations and definitions of
+.I identifier
+in all .c and .h files under
+.RI < . > .
+.I identifier
+is normally a C identifier,
+but it is actually a PCRE pattern,
+so it can be used to find complex patterns.
+.SH AUTHORS
+Originally written by
+.MT alx.manpages@gmail.com
+Alejandro Colomar
+.ME .
+.SH SEE ALSO
+.MR pcregrep 1 ,
+.MR pcresyntax 3 ,
+.MR pcrepattern 3
+.PP
+Homepage:
+.UR http://www.alejandro-colomar.es/src/alx/alx/grepc.git
+.UE