[PATCH:libXrandr] Constify a couple string arguments that are just copied, not modified

[Alan Coopersmith]

Fixes compiler warnings when building app/xrandr:

xrandr.c: In function ‘crtc_set_transform’:
xrandr.c:1459:9: warning: passing argument 4 of ‘XRRSetCrtcTransform’ discards qualifiers from pointer target type
X11/extensions/Xrandr.h:419:1: note: expected ‘char *’ but argument is of type ‘const char *’

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 include/X11/extensions/Xrandr.h |    4 ++--
 src/XrrCrtc.c                   |    2 +-
 src/XrrMode.c                   |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/X11/extensions/Xrandr.h b/include/X11/extensions/Xrandr.h
index b1baf8a..f394864 100644
--- a/include/X11/extensions/Xrandr.h
+++ b/include/X11/extensions/Xrandr.h
@@ -341,7 +341,7 @@ XRRGetOutputProperty (Display *dpy, RROutput output,
 		      unsigned char **prop);
 
 XRRModeInfo *
-XRRAllocModeInfo (char *name, int nameLength);
+XRRAllocModeInfo (_Xconst char *name, int nameLength);
 
 RRMode
 XRRCreateMode (Display *dpy, Window window, XRRModeInfo *modeInfo);
@@ -419,7 +419,7 @@ void
 XRRSetCrtcTransform (Display	*dpy,
 		     RRCrtc	crtc,
 		     XTransform	*transform,
-		     char	*filter,
+		     _Xconst char *filter,
 		     XFixed	*params,
 		     int	nparams);
 
diff --git a/src/XrrCrtc.c b/src/XrrCrtc.c
index 0762373..04087c5 100644
--- a/src/XrrCrtc.c
+++ b/src/XrrCrtc.c
@@ -306,7 +306,7 @@ void
 XRRSetCrtcTransform (Display	*dpy,
 		     RRCrtc	crtc,
 		     XTransform	*transform,
-		     char	*filter,
+		     _Xconst char *filter,
 		     XFixed	*params,
 		     int	nparams)
 {
diff --git a/src/XrrMode.c b/src/XrrMode.c
index 0b74a73..e605e8a 100644
--- a/src/XrrMode.c
+++ b/src/XrrMode.c
@@ -33,7 +33,7 @@
 #include "Xrandrint.h"
 
 XRRModeInfo *
-XRRAllocModeInfo (char *name, int nameLength)
+XRRAllocModeInfo (_Xconst char *name, int nameLength)
 {
     XRRModeInfo	*mode_info;
 
-- 
1.7.9.2