chmod +x 7z.dll and 7z.exe for cygwin

TBR=pkasting@chromium.org
BUG=323300

Review URL: https://codereview.chromium.org/178193008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@254042 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/win_toolchain/7z/7z.dll b/win_toolchain/7z/7z.dll
old mode 100644
new mode 100755
Binary files differ
diff --git a/win_toolchain/7z/7z.exe b/win_toolchain/7z/7z.exe
old mode 100644
new mode 100755
Binary files differ