graphics/qgis: Disable usage of ccache

If ccache is used, the build breaks with
ccache: error: unknown configuration option "compiler_type"

PR:		284996
Reported by:	Martin Birgmeier <d8zNeCFG@aon.at>

graphics/qgis/Makefile

 PORTNAME=	qgis
 DISTVERSION=	3.42.0
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	graphics geography
 MASTER_SITES=	https://qgis.org/downloads/
 
@@ -136,8 +136,7 @@ CMAKE_ARGS+=	-DCMAKE_BUILD_TYPE:STRING=Release \
 CMAKE_ON=	USE_OPENCL WITH_ASTYLE WITH_BINDINGS WITH_COPC \
 		WITH_CUSTOM_WIDGETS WITH_DRACO WITH_EPT \
 		WITH_INTERNAL_LAZPERF WITH_INTERNAL_MDAL WITH_POSTGRESQL
- 
-CMAKE_OFF=	BUILD_WITH_QT6 ENABLE_TESTS WITH_QTWEBKIT \
+CMAKE_OFF=	BUILD_WITH_QT6 ENABLE_TESTS USE_CCACHE WITH_QTWEBKIT \
 		WITH_QWTPOLAR
 
 CONFLICTS_INSTALL=	qgis-ltr