Replace egrep with grep -E
#4584
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For the GNU Grep package version >= 3.8, the `egrep` command emits: ``` egrep: warning: egrep is obsolescent; using grep -E ``` which makes the `./autogen.sh` script very noisy.
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For the GNU Grep package version >= 3.8, the
egrepcommand emits:which makes the
./autogen.shscript very noisy.