Keep the build clean of extraneous files if it is indeed clean.
Otherwise leave the msvc-build-makedryerrors.txt file both as
a flag for any CI system or for manual debugging.

Note that the file will contain the new values of the GIT_VERSION
and GITGUI_VERSION if they were generated by the make file. They
are omitted if the release is tagged and indentically defined in
their respective GIT_VERSION_GEN file DEF_VER variables.

Signed-off-by: Philip Oakley <philipoak...@iee.org>
---
 contrib/buildsystems/engine.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/contrib/buildsystems/engine.pl b/contrib/buildsystems/engine.pl
index 7eba870..27884f7 100644
--- a/contrib/buildsystems/engine.pl
+++ b/contrib/buildsystems/engine.pl
@@ -77,6 +77,8 @@ EOM
 
 my $ErrsFile = "msvc-build-makedryerrors.txt";
 @makedry = `cd $git_dir && make -n MSVC=1 NO_PERL=1 V=1 2>$ErrsFile` if 
!@makedry;
+# test for an empty Errors file and remove it
+for ($ErrsFile) {unlink $_ if (-f $_) && (!-s $_);}
 
 # Parse the make output into usable info
 parseMakeOutput();
-- 
2.3.1

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