add Win32 USE_NO_REGISTRY build option

-the first arg of win32_get_privlib is not used if the registry is not
 queried, create a macro to allow the arg to drop out on WIN32_NO_REGISTRY
 builds for efficiency and not to have unused C litteral strings in the
 binary
-This patch changes the ABI of
 PerlEnv_lib_path/PerlEnvLibPath/win32_get_privlib between USE_NO_REGISTRY
 and no USE_NO_REGISTRY. Since win32_get_privlib is not exported from
 perl523.dll, assume it and PerlEnv_lib_path are not public API, note
 technically PerlEnv_lib_path will be callable only on PERL_IMPLICIT_SYS
 builds, on no PERL_IMPLICIT_SYS builds it will fail at link time since
 win32_get_privlib isnt exported. Therefore place it in
 non-[affecting]-binary compatibility even though it does affect binary
 compatibility.
-delay load advapi32.dll to save startup time (loading the DLL and the DLL
 calling its initializers in DllMain) and one 4 KB memory page for
 advapi32's .data section (doing "perl -E"sleep 100" on WinXP shows
 advapi32 has a 20KB long .data section, first 4 KB are unique to the
 process, the remaining 16KB are COW shared between processes according
 to vmmap tool), putting a DebugBreak() in pp_getlogin and doing a
 "nmake all" shows miniperl never calls getlogin during the build process.
 An nmake test shows only ext/POSIX/t/wrappers.t and lib/warnings.t execute
 pp_getlogin. Keeping advapi32.dll out of the perl process requires
 removing comctl32.dll, since comctrl32.dll loads advapi32.dll, from perl
 which I always do as a custom patch.

filed as [perl #123658]

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1 files changed, 2 insertions, 1 deletions

diff --git a/README.win32 b/README.win32
index 7e6565387e..672601988d 100644
--- a/README.win32
+++ b/README.win32
@@ -485,7 +485,8 @@ You can also control the shell that perl uses to run system() and
 backtick commands via PERL5SHELL.  See L<perlrun>.
 
 Perl does not depend on the registry, but it can look up certain default
-values if you choose to put them there.  On Perl process start Perl checks if
+values if you choose to put them there unless disabled at build time with
+USE_NO_REGISTRY.  On Perl process start Perl checks if
 C<HKEY_CURRENT_USER\Software\Perl> and C<HKEY_LOCAL_MACHINE\Software\Perl>
 exist.  If the keys exists, they will be checked for remainder of the Perl
 process's run life for certain entries.  Entries in