bug#37672: espeak 1.48.04 build failure

[Bradley Haggerty]

guix version:
  guix cf3d176
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: cf3d1763ede1a329c2bc932c84591ab594bb6c96

build log here: https://paste.debian.net/1105451/