[Xcb] bug in definition of xcb_cap_style_t

[Yang JianJun]

  Dash line takes no effect when porting gtk to xcb. After debug, I found
the reason is a bug in enumeration type xcb_cap_style_t. So
XCB_CAP_STYLE_BUTT should be 1, and XCB_CAP_STYLE_CAP should be 2, according
to X.h.
  I have reported the bug at
https://bugs.freedesktop.org/show_bug.cgi?id=8857.

Jianjun
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