• Update to 2.18.26
• Change LIB_DEPENDS from qwt5 to qwt6
• Reorder CMAKE_ARGS
• Adapt QWT_INCLUDE_DIR and QWT_LIBRARY after PyQt changes
• Update GRASS7 dependency from 7.2.2 to 7.4.0
• Update several Python dependencies
• Remove INSTALLS_ICONS, not needed here

PR: 233504
Submitted by: rhurlin@gwdg.de(maintainer)