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4614834: Xlib color functions are not MT-safe

In a multithreaded Xlib client:

    * concurrent access to XAllocNamedColor() make the client crash
    * concurrent access to XLookupColor() make the client crash

The cause of the problem is that in multithread environment some data
in XLookupColor() and XAllocNamedColor() can be accessed/modified at
same time by multi threads. Adding some lock and unlock code to make
sure only one thread can access the data at one time fixed the
problem.

diff --git a/src/GetColor.c b/src/GetColor.c
index cd0eb9f..62b3bce 100644
--- a/src/GetColor.c
+++ b/src/GetColor.c
@@ -55,12 +55,14 @@ XColor *exact_def) /* RETURN */
     if ((ccc = XcmsCCCOfColormap(dpy, cmap)) != (XcmsCCC)NULL) {
 	const char *tmpName = colorname;
 
+	LockDisplay(dpy);
 	switch (_XcmsResolveColorString(ccc, &tmpName, &cmsColor_exact,
 					XcmsRGBFormat)) {
 	case XcmsSuccess:
 	case XcmsSuccessWithCompression:
 	    _XcmsRGB_to_XColor(&cmsColor_exact, exact_def, 1);
 	    memcpy((char *)hard_def, (char *)exact_def, sizeof(XColor));
+	    UnlockDisplay(dpy);
 	    ret = XAllocColor(dpy, cmap, hard_def);
 	    exact_def->pixel = hard_def->pixel;
 	    return(ret);
@@ -73,6 +75,7 @@ XColor *exact_def) /* RETURN */
 	     */
 	    break;
 	}
+	UnlockDisplay(dpy);
     }
 #endif
 
diff --git a/src/LookupCol.c b/src/LookupCol.c
index f7f969f..718e043 100644
--- a/src/LookupCol.c
+++ b/src/LookupCol.c
@@ -53,6 +53,7 @@ XLookupColor (
 	if ((ccc = XcmsCCCOfColormap(dpy, cmap)) != (XcmsCCC)NULL) {
 	    const char *tmpName = spec;
 
+	    LockDisplay(dpy);
 	    switch (_XcmsResolveColorString(ccc, &tmpName, &cmsColor_exact,
 					    XcmsRGBFormat)) {
 	    case XcmsSuccess:
@@ -60,6 +61,7 @@ XLookupColor (
 		_XcmsRGB_to_XColor(&cmsColor_exact, def, 1);
 		memcpy((char *)scr, (char *)def, sizeof(XColor));
 		_XUnresolveColor(ccc, scr);
+		UnlockDisplay(dpy);
 		return(1);
 	    case XcmsFailure:
 	    case _XCMS_NEWNAME:
@@ -70,6 +72,7 @@ XLookupColor (
 		 */
 		break;
 	    }
+	    UnlockDisplay(dpy);
 	}
 #endif