fix: Fix sporadic test.profiling failures (ccache#1056)

Using cut, which is always line-based, to remove bytes from a binary file can
cause problems if the binary timestamp field happens to contain a newline
character, which causes test.profiling to fail <1% of the time. Instead use tail
which has a character mode that ignores newlines.

test/suites/profiling.bash

@@ -2,7 +2,7 @@
 normalize_gcno_file() {
     local from="$1"
     local to="$2"
-    cut -b 13- "${from}" >"${to}"
+    tail -c +13 "${from}" >"${to}"
 }