gcc-4.9: increase sleep to 10s

This was missed in October.
https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/master/GCC_4_9_DEPRECATION.md

Bug: 147240075
Test: (trying to see what fails in post submit)
Change-Id: I8a1386b38a1531c677d2623d4ade716f0592dbaa
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
1 file changed