Skip to GDB version string when initializing debugger. This allows
to use ~/.gdbinit file.
This is especially important when "skip" commands used in .gdbinit.
Using such commands results in following answers from GDB:
kdevelop.plugins.gdb: "File(s) /usr/include/c++/*/*/* will be skipped when stepping.\n" kdevelop.plugins.gdb: "File(s) /usr/include/c++/*/* will be skipped when stepping.\n" kdevelop.plugins.gdb: "File(s) /usr/include/c++/* will be skipped when stepping.\n" kdevelop.plugins.gdb: "GNU gdb (Ubuntu 8.2.91.20190405-0ubuntu3) 8.2.91.20190405-git\n"
So current implementation will read first string and say that only GDB 7.0.0 and later supported.