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build: Use EGREP to generate graphviz_version.h

Raphael Kubo da Costa requested to merge gh-75f84028/1179/rakuco/egrep-for-version-header into master

According to POSIX, '|' only works as an alternation character in grep when it is extended regular expression mode (egrep, or grep -E).

This is not an issue most of the time because GNU grep accepts it in non-extended expressions as well, but other grep implementations adhering to the standard will fail to match the pattern used to generate graphviz_version.h.

Switching to EGREP (which also requires not escaping the '|'s) makes it work for all implementations.

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