editors/texstudio:

• Add patch to fix build on armv6 [1,2]
• Add option to build with Qt 4 or 5, enable Qt 5 by default [2]
• Remove needless INSTALLS_ICONS

PR: 199487 [1]
Reported by: Ulrich Grey
Patch by: mikael.urankar@gmail.com

PR: 202511 [2]
Submitted by: Abilio Marques (maintainer)