2.23.11 build failure on cygwin #1

[Marco Atzeri]

Dear Developers,

I am the Cygwin package maintainer for Lilypond and Guile
latest 2.22.2 builds without issue.

On the first tentative to build/package 2.23.x for Cygwin I hit two 
different problems so I will report them separately


first one is almost immediate

----------------------------------------------
Making flower/out/library.a
make[1]: *** No rule to make target 'out/lilypond.1', needed by 'man'. 
Stop.
make: *** 
[/pub/devel/lilypond/lilypond-2.23.11-1.x86_64/src/lilypond-2.23.11/./make/generic-targets.make:6: 
all] Error 2
*** ERROR: make failed
----------------------------------------------

a workaround is to replace on lily/GNUmakefile

   HELP2MAN_EXECS = lilypond
with
   HELP2MAN_EXECS = lilypond$(program_suffix)

the build completes but has the unwanted outcome of
an extra ".exe" on the manual page

  $ find lily -name "*.1"
  lily/out/lilypond.exe.1

so a different solution is welcome

Regards
Marco