sync code with last improvements from OpenBSD

doc/gl-docs/GL/glx/xqueryextensionsstring.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 26309 3 xqueryextensionsstring.gl
+.TH GLXQUERYEXTENSIONSSTRING 3
+.SH NAME
+glXQueryExtensionsString
+\- return list of supported extensions
+
+.SH C SPECIFICATION
+const char * \f3glXQueryExtensionsString\fP(
+Display \fI*dpy\fP,
+.nf
+.ta \w'\f3const char * \fPglXQueryExtensionsString( 'u
+	int \fIscreen\fP )
+.fi
+
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+.TP \w'\fIscreen\fP\ \ 'u 
+\f2dpy\fP
+Specifies the connection to the X server.
+.TP
+\f2screen\fP
+Specifies the screen.
+.SH DESCRIPTION
+\f3glXQueryExtensionsString\fP  returns a pointer to a string describing
+which GLX extensions are supported on the connection. The string
+is null-terminated and contains a space-separated list of 
+extension names.  (The extension names themselves never contain 
+spaces.) If there are no extensions to GLX, then the empty string is 
+returned. 
+.SH NOTES
+\f3glXQueryExtensionsString\fP is available only if the GLX version is 1.1 or greater.
+.P
+\f3glXQueryExtensionsString\fP only returns information about GLX extensions. Call 
+\f3glGetString\fP to get a list of GL extensions.
+.SH SEE ALSO
+\f3glGetString\fP,
+\f3glXQueryVersion\fP, 
+\f3glXQueryServerString\fP,
+\f3glXGetClientString\fP