linux-fusion: fix build after af52661d (linux: rename LINUX26 to LINUX)

linux-fusion uses a number of linux-specific variables. Adjust to match
their new names.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/linux-fusion/linux-fusion.mk

@@ -9,12 +9,12 @@ LINUX_FUSION_SITE = http://directfb.org/downloads/Core/linux-fusion
 LINUX_FUSION_INSTALL_STAGING = YES
 LINUX_FUSION_DEPENDENCIES = linux
 
-LINUX_FOR_FUSION=$(LINUX26_VERSION_PROBED)
+LINUX_FOR_FUSION=$(LINUX_VERSION_PROBED)
 LINUX_FUSION_ETC_DIR=$(TARGET_DIR)/etc/udev/rules.d
 
 LINUX_FUSION_MAKE_OPTS =  KERNEL_VERSION=$(LINUX_FOR_FUSION)
-LINUX_FUSION_MAKE_OPTS += KERNEL_BUILD=$(LINUX26_DIR)
-LINUX_FUSION_MAKE_OPTS += KERNEL_SOURCE=$(LINUX26_DIR)
+LINUX_FUSION_MAKE_OPTS += KERNEL_BUILD=$(LINUX_DIR)
+LINUX_FUSION_MAKE_OPTS += KERNEL_SOURCE=$(LINUX_DIR)
 
 LINUX_FUSION_MAKE_OPTS += SYSROOT=$(TARGET_DIR)
 LINUX_FUSION_MAKE_OPTS += ARCH=$(KERNEL_ARCH)