Ok, I made a script to grep all the `#define` and `#undef` symbols in 
`config.h` and Geany appears to be fairly careful using `ifdef` `ifndef` or 
`defined()`, Scintilla has at least one place where it compares a symbol to 0, 
but I think its its own internal one so fine.

But ctags!!!!  `if HAVE_FOO && HAVE_BAR && HAVE_BLETCH` all over the place.  
This relies on the identifiers having been defined `1` or it would become `if 
&& &&` after the defined but empty identifiers were substituted.  Sigh!!!

So I guess we have no choice but to continue defining `1` until C23 when `true` 
will be accepted :-)

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