fix setting file attributes after zip extraction

- otherwise the combine step looses the executable flag
Merge pull request #31 from MartinNowak/fixAttrs

[install] fix setting file attributes after zip extraction
Merge pull request #24 from Abscissa/create_dmd_release

Add create_dmd_release utility.
Merge pull request #31 from MartinNowak/fixAttrs

[install] fix setting file attributes after zip extraction
remove -L--no-warn-search-mismatch

- Not available for FreeBSD linker.
- Not needed because we only use the correct phobos lib dir.
remove temporary findtags tools
fix Issue 11799 - Incompatible argument types in create_dmd_release

- use std.file.setAttributes
fix Windows build error
fix libCurl download

- Use same URL/zip as windows installer.
- get_dlibcurl32 fails, because the downloaded libcurl.dll
  depends on additional dlls.
- Use std.net.curl to download the zip, i.e. create_dmd_release
  depends on a working libcurl.dll, but uses the downloaded one
  to build a release.
update man pages source paths
Merge pull request #36 from jordisayol/master

update deb/rpm man pages source paths
Only delete the installation folder if it is empty

Prevents deleting stuff added by end users in the root of the installation folder.
Merge pull request #37 from eco/patch-5

Only delete the installation folder if it is empty
remove windows installer from Linux packages building process
delete commented lines
Merge pull request #38 from jordisayol/master

remove windows installer from Linux packages building process
copy ini files from dmd folder
Merge pull request #34 from MartinNowak/fixWin

[2.065] fix Windows build error
Merge pull request #35 from MartinNowak/fetchCurl

[2.065] fix libCurl download
Merge pull request #39 from MartinNowak/dmd_ini

copy ini files from dmd folder