Updated py-cparser to 2.15.

+ Version 2.15 (18.10.2016)

  - PR #121: Update bundled PLY version to 3.8
  - Issue #117: Fix parsing of extra semi-colons inside structure declarations.
  - PR #109: Update c_generator to add {} around nested named initializers.
  - PR #101: Added support for parsing pragmas into the AST.
  - Additional fake headers and typedefs, manifest fixes (#97, #106, #111).
  - Testing with Python 3.5 instead of 3.3 now (3.4 and 3.5 are the 3.x versions
    tested).
  - PR #145: More complete support for offsetof()
  - Issue #116: Fix line numbers recorded for empty and compound statements.
  - Minor performance improvement to the invalid string literal regex.

(wiz)