www/linux-c7-qtwebkit: Fix fetch

This port is amd64-only and does not provide 32 bit libraries.
Before 6672772 amd64-only ports did not try to fetch 32 bit
libraries.

Reported by:	bdrewery
Fixes:		6672772 Various Linux CentOS 7 updates

www/linux-c7-qtwebkit/Makefile

@@ -15,7 +15,7 @@ USES=		cpe linux:c7
 CPE_VENDOR=	qt
 USE_LDCONFIG=	yes
 USE_LINUX=	fontconfig png xorglibs sqlite3 qt qt-x11
-USE_LINUX_RPM=	yes
+USE_LINUX_RPM=	nolib
 
 CONFLICTS=	linux-c6-qt47-webkit