registry.cc: debug_printf() intentionally changed to system_printf() ?

[Christian Franke]

winsup/cygwin/registry.cc CVS 1.42 changed debug_printf() to 
system_printf() in get_registry_hive_path().

This results in bogus messages e.g. if $USERPROFILE is evaluated by 
spenv::retrieve() in exec*()

Testcase:
$ cygdrop -- echo hello
       2 [main] cygdrop 2716 get_registry_hive_path: ProfileImagePath 
for S-1-5-21-....
hello

Christian


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