blahtexml: Fix for Linuxbrew
blahtexml: Fix for Linuxbrew

Closes Linuxbrew/linuxbrew#990.

Signed-off-by: Bob W. Hogg <c772a964fd55352a3510e5d535dd9ccc9ac30168@linux.com>

gnubila-france/linuxbrew,Linuxbrew/linuxbrew,SuperNEMO-DBD/cadfaelbrew,SuperNEMO-DBD/cadfaelbrew,Linuxbrew/linuxbrew,gnubila-france/linuxbrew,Homebrew/linuxbrew,gnubila-france/linuxbrew,saketkc/linuxbrew,SuperNEMO-DBD/cadfaelbrew,saketkc/linuxbrew,Angeldude/linuxbrew,saketkc/linuxbrew,SuperNEMO-DBD/cadfaelbrew,reelsense/linuxbrew,Homebrew/linuxbrew,Angeldude/linuxbrew,gnubila-france/linuxbrew,Linuxbrew/linuxbrew,Angeldude/linuxbrew,saketkc/linuxbrew,Linuxbrew/linuxbrew,reelsense/linuxbrew,reelsense/linuxbrew,Homebrew/linuxbrew,reelsense/linuxbrew,Homebrew/linuxbrew,Angeldude/linuxbrew