build-style/cmake: only depends on cmake for non-cmake package

* In the next change, we will remove it from cmake template entirely

common/environment/build-style/cmake.sh

@@ -1,5 +1,7 @@
 if [ "$CHROOT_READY" ]; then
-	hostmakedepends+=" cmake"
+	if [ "$pkgname" != cmake ]; then
+		hostmakedepends+=" cmake"
+	fi
 	if [ "${make_cmd:-ninja}" = ninja ]; then
 		hostmakedepends+=" ninja"
 	fi

srcpkgs/cmake/template

@@ -20,6 +20,7 @@ replaces="cmake-bootstrap>=0"
 
 if [ "$CROSS_BUILD" ]; then
 	build_style=cmake
+	hostmakedepends+=" cmake"
 	configure_args="-DCMAKE_DOC_DIR=/share/doc/cmake
 	 -DCMAKE_USE_SYSTEM_LIBRARIES=ON -DKWSYS_LFS_WORKS=1"
 fi