ccc: Remove unknown host warning, it was breaking gcc's configure.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65276 91177308-0d34-0410-b5e6-96231b3b80d8

tools/ccc/ccclib/HostInfo.py

@@ -117,5 +117,4 @@ def getHostInfo(driver):
     if handler:
         return handler(driver)
 
-    driver.warning('Unknown host %r, using generic host information.' % system)
     return UnknownHostInfo(driver)