When using cpp's #define-s, one has to deal with a huge difference
between

#define FOO(Bar)
and
#define FOO (Bar)

the first one being a macro function, the second one a macro that
expands itself to (Bar).

glasses.el is guilty of adding a space between FOO and (Bar), making
the function looking like a simple macro. It is even more guilty of
actually changing this in the file if `glasses-convert-on-write-p' is
set to t, corrupting the very meaning of the cpp !

The following patch addresses those two problems and a minor another
one (glasses.el has to modify the file also if paren separating is t).