sync code with last improvements from OpenBSD

doc/gl-docs/GL/glx/xfreecontextext.3gl

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+'\"! eqn | mmdoc
+'\"macro stdmacro
+.ds Vn Version 1.2
+.ds Dt 6 March 1997
+.ds Re Release 1.2.0
+.ds Dp Feb 16 02:56
+.ds Dm  Feb 10 17:2
+.ds Xs 37853 3 xfreecontextext.gl
+.TH GLXFREECONTEXTEXT 3
+.SH NAME
+glXFreeContextEXT
+\- free client-side memory for imported context
+
+.SH C SPECIFICATION
+void \f3glXFreeContextEXT\fP(
+Display \fI*dpy\fP,
+.nf
+.ta \w'\f3void \fPglXFreeContextEXT( 'u
+	GLXContext \fIctx\fP )
+.fi
+
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+.TP \w'\f2dpy\fP\ \ 'u 
+\f2dpy\fP
+Specifies the connection to the X server.
+
+.TP
+\f2ctx\fP
+Specifies a GLX rendering context.
+
+.SH DESCRIPTION
+\f3glXFreeContextEXT\fP frees the client-side part of a GLXContext that 
+was created with \f3glXImportContext\fP. \f3glXFreeContextEXT\fP does not 
+free the server-side context information or the XID 
+associated with the server-side context.
+.P
+\f3glXFreeContextEXT\fP is part of the \f3EXT_import_context\fP extension,
+not part of the core GLX command set. If \f3GLX_EXT_import_context\fP
+is included in the string returned by \f3glXQueryExtensionsString\fP,
+when called with argument \f3GLX_EXTENSIONS\fP,
+extension \f3EXT_vertex_array\fP is supported.
+
+.SH ERRORS
+\f3GLXBadContext\fP is generated if \f2ctx\fP does not
+refer to a valid context.
+
+.SH SEE ALSO
+\f3glXCreateContext\fP,
+\f3glXQueryVersion\fP,
+\f3glXQueryExtensionsString\fP,
+\f3glXImportContextEXT\fP