Fix: Correct no-exceptions removal for cc_opts and opts

[GWRon]

"print" is incorrect but not caught as error messages in the bmk files are ignored there.
Also the "opts" replaced stuff in "cc_opts" incorrectly.

While ":find()" can return Null, ":gsub" simply returns self even if nothing was changed

[GWRon]

Attention: This is variant2, there is variant1 too: #138

It depends on what you want:
variant1 assumes that fno-exception is just to remove from cc_opts.
variant2 assumes that fno-exceptions should be removed from cc_opts AND opts.

[GWRon]

PS:
https://blitzmax.org/docs/en/language/pre_post_compilation_scripts/

SuperStrict

' @bmk echo *** Building my cool app ***
' @bmk include "my_own_scripts.bmk"
'
' @bmk push cc_opts
' @bmk addccopt -DSPECIAL_OPTION
'
' @bmk make "src/someglue.cpp"
'
' @bmk pop cc_opts
' @bmk make "src/other.cpp"
'

The example is incorrect ...when adding/setting opts you now need a "key" (some name so you can override later)

The example itself won't compile because of
bmx-ng/bcc#656
(I simply added "newlines" between the commands to work around)