switch to clang-format-3.8 (#2547)

https://llvm.org/bugs/show_bug.cgi?id=30353 was filed for the unintended
line break between in e.g. “TAILQ_ENTRY(foo)\nbar;”.

Until that’s fixed or a workaround is known, we’ll live with line
breaks. To make it a bit easier for readers to see what’s going on, I
added extra line breaks around each such struct member/variable
definition, so that they at least visually are a single unit.

fixes #2174

i3bar/include/workspaces.h

@@ -40,5 +40,6 @@ struct i3_ws {
     rect rect;                /* The rect of the ws (not used (yet)) */
     struct i3_output *output; /* The current output of the ws */
 
-    TAILQ_ENTRY(i3_ws) tailq; /* Pointer for the TAILQ-Macro */
+    TAILQ_ENTRY(i3_ws)
+    tailq; /* Pointer for the TAILQ-Macro */
 };