* set `preserve_escapes` to 0 in guest/_c_base.pm so escapes are stripped in:
<pragma-> ,show testcargs
<candide> [global] testcargs: /code c11 printf("/say args: " ); while
(*++argv) printf("[%s] " , *argv);
<pragma-> ,testcargs foo\'bar baz\'qux
<candide> args: [foo\'bar] [baz\'qux]
to produce the desired output of:
<candide> args: [foo'bar] [baz'qux]
* set `keep_spaces` to 1 in host/_default.pm since it turns out that in some
languages unquoted spaces are significant, e.g. in `sh ${1% *}` to strip
text following two spaces. Without `keep_spaces` enabled, `sh ${1% *}`
becomes `sh ${1% *}` and strips all text following one space instead of two.
