https://bugs.gentoo.org/649440
https://github.com/ccache/ccache/issues/442

Disable cleanup based on free filesystem size.

--- a/test/suites/cleanup.bash
+++ b/test/suites/cleanup.bash
@@ -75,6 +75,9 @@ SUITE_cleanup() {
     done
 
     # -------------------------------------------------------------------------
+# Disable test in Gentoo as we don't control temporary filesystem:
+#     https://bugs.gentoo.org/649440
+if false; then
     TEST "Forced cache cleanup, size limit"
 
     # NOTE: This test is known to fail on filesystems that have unusual block
@@ -101,7 +104,7 @@ SUITE_cleanup() {
         file=$CCACHE_DIR/a/result$i-4017.o
         expect_file_exists $file
     done
-
+fi
     # -------------------------------------------------------------------------
     TEST "Automatic cache cleanup, limit_multiple 0.9"