build: Use EGREP to generate graphviz_version.h #1179
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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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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.