setup.sh does not correctly detect the GCC version

[SanPollo]

On FreeBSD 14.1-RELEASE, setup.sh does not correctly detect the GCC version, and stops running. Tested with both GCC 13 and 14.

===============================================================
== 1: CPCtelera initial tests
===============================================================
> Checking directory structure... [ OK ]
> Checking important files....... [ OK ]
> Checking required commands...
>>> Looking for 'gcc'... [ OK ]
>>> Looking for 'g++'... [ OK ]
>>> Looking for 'make'... [ OK ]
>>> Looking for 'bison'... [ OK ]
>>> Looking for 'flex'... [ OK ]
>>> Looking for 'mono'... [ OK ]
> Checking command versions...
>>> GNU GCC/G++ Version >= 4.6...

#########################
## UNRECOVERABLE ERROR ##
#########################
##> CPCtelera requires GCC 4.6 or greater. Please, update    your GCC version and run setup again.