Karl Palsson 81d0ddc806 prereq-build: g++ formatting and consistency fixes
Remove \n that mangles output, and fix inconsistent version name check.

Example before:

Build dependency: Please install the GNU C++ Compiler (g++) 6 or later
Build dependency: \nPlease reinstall the GNU C++ Compiler (4.8 or later) - it appears to be broken
Build dependency: Please install ncurses. (Missing libncurses.so or ncurses.h)

Signed-off-by: Karl Palsson <karlp@tweak.net.au>
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