[C++] Make the fast pass of EscapeShell consistent with the rest
diff --git a/ninja.cc b/ninja.cc
index fc7771b..9c85815 100644
--- a/ninja.cc
+++ b/ninja.cc
@@ -471,7 +471,7 @@
   }
 
   void EscapeShell(string* s) const {
-    if (s->find_first_of("$`!\\\"") == string::npos)
+    if (s->find_first_of("$`\\\"") == string::npos)
       return;
     string r;
     bool last_dollar = false;