Merge pull request #1245 from sm00th/oot_fix

Fix oot-module builds

Author: joe-lawrence

kpatch-build/kpatch-build

@@ -1152,7 +1152,7 @@ for ((idx=0; idx<${#MAKEVARS[@]}; idx++)); do
     MAKEVARS[$idx]=${MAKEVARS[$idx]/${KPATCH_CC_PREFIX}/}
 done
 
-export KPATCH_BUILD="$BUILDDIR" KPATCH_NAME="$MODNAME" \
+export KPATCH_BUILD="$KERNEL_SRCDIR" KPATCH_NAME="$MODNAME" \
 KBUILD_EXTRA_SYMBOLS="$KBUILD_EXTRA_SYMBOLS" \
 KPATCH_LDFLAGS="$KPATCH_LDFLAGS"
 save_env