Fix aclocal.m4 fontforge version detection

Felix Janda <[email protected]>
Newsgroups gmane.comp.gnu.lilypond.bugs
Message-ID <ZhwUqatfthnVV-Rb@localhost> 
Hi,

I am forwarding this bug report here:

https://bugs.gentoo.org/913928

TL;DR: On systems using the mksh shell, building lilypond from source
fails with an error like 

ERROR: Please install required programs:  /usr/bin/fontforge >= 20110222 (installed: 20230101)

This is because of some non-portable code in aclocal.m4.

Felix
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