Use short file names in -imsvc includes on Windows.

The compilation command line is too long (exceeds 8,192 chars) for some
compile commands. This is an attempt to shorten it.

Also, turned down the verbosity of output.

patches/build-toolchain-win-setup_toolchain.py.patch

@@ -0,0 +1,13 @@
+diff --git a/build/toolchain/win/setup_toolchain.py b/build/toolchain/win/setup_toolchain.py
+index 2ab240da454821965080c82899c382a57d674d80..3d4381a30486655965aebd84ee152dce939d1801 100644
+--- a/build/toolchain/win/setup_toolchain.py
++++ b/build/toolchain/win/setup_toolchain.py
+@@ -272,7 +272,7 @@ def main():
+       def q(s):  # Quote s if it contains spaces or other weird characters.
+         return s if re.match(r'^[a-zA-Z0-9._/\\:-]*$', s) else '"' + s + '"'
+       include_I = ' '.join([q('/I' + i) for i in include])
+-      include_imsvc = ' '.join([q('-imsvc' + i) for i in include])
++      import win32api; include_imsvc = ' '.join([q('-imsvc' + win32api.GetShortPathName(i)) for i in include])
+       libpath_flags = ' '.join([q('-libpath:' + i) for i in lib])
+ 
+       if (environment_block_name != ''):

script/redirect-cc.cmd

@@ -1 +1,2 @@
-python ..\..\brave\script\redirect-cc.py %*
+@ECHO OFF
+python ..\..\brave\script\redirect-cc.py %*