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docs: replace fgrep with grep -F

It's been deprecated for decades and in Debian system it's starting
to print warnings. Just use grep -F instead.

Signed-off-by: Ralph Giles <giles@thaumas.net>

--- a/doc/build_isobmff.sh

+++ b/doc/build_isobmff.sh

@@ -46,5 +46,5 @@

 cat ${CSS}  | sed -e 's/ *$//g' > ${CSS}+ && mv ${CSS}+ ${CSS}

-VERSION=$(fgrep Version ${HTML} | sed 's/.*Version \([0-9]\.[0-9]\.[0-9]\).*/\1/')

+VERSION=$(grep -F Version ${HTML} | sed 's/.*Version \([0-9]\.[0-9]\.[0-9]\).*/\1/')

 echo Now at version ${VERSION}