Require a word character immediately before space

Modified the inital regex to require a word character immediately
(except spaces) before the bracket. This ensures we are not just a order
of operations bracket but in fact a function call. Added a regression
test that checks the case that this is required for

Author: thk123

regression/cpp-linter/multi-line-function-call3/main.cpp

@@ -44,4 +44,12 @@ static void fun()
   {
     do_something();
   }
+
+  // Correct since if statement
+  if(condition_a&&
+    (condition_b||
+      condition_c))
+  {
+    do_something();
+  }
 }

scripts/cpplint.py

@@ -4696,7 +4696,7 @@ def CheckStyle(filename, clean_lines, linenum, file_extension, nesting_state,
   #  - ignore the line if it is a for/if etc since rules are different
 
   # Look for an opening bracket that doesn't have a semi-colon on the same line
-  bracket_search = Search(r'(?P<bracket>\()[^;]*$', elided_line)
+  bracket_search = Search(r'[\w_]+\s*(?P<bracket>\()[^;]*$', elided_line)
 
   # Exclude the check if any of these keywords are present
   # They could trip us up as they have different formatting rules to functions