[patch] Ignore KeepEmptyLinesAtTheStartOfBlocks for extern "C" blocks

[Nico Weber]

Hi,

KeepEmptyLinesAtTheStartOfBlocks is ignored for namespace blocks. extern
"C" blocks are similar to namespaces, so it should be ignored there too.
(Requested here: http://crbug.com/432640)

The attached patch implements this.

Nico
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