Add comments about version sync requirement, and strengthen deskutils/gucharmap BUILD_DEPENDS version specifier. This also reverts commit 6ca002d89c860b63d4a925d30f1ed2a063aece91. Reported by: olgeni PR: 273796 Approved by: vishwin (gnome, maintainer deskutils/gucharmap) thierry (maintainer textproc/UCD)