Revert "VBOX: Fix a crashing bug on Windows.  If we fail to acquire a machine state lock, just report a VM start failure instead of crashing."

This reverts commit 7efd4b47.

cppcheck: Fix reports "Prefer prefix ++/-- operators for non-primitiv…

[client/app.cpp:313]: (performance) Prefer prefix ++/-- operators for non-primitive types.
[client/result.cpp:693]: (performance) Prefer prefix ++/-- operators for non-primitive types.

cppcheck: fix 2 reports

[clientgui/browser.cpp:375]: (error) Width 4096 given in format string (no. 1) is larger than destination buffer 'cookie_value[4096]', use %4095s to prevent overflowing it.
[clientgui/browser.cpp:575]: (error) Width 4096 given in format string (no. 1) is larger than destination buffer 'cookie_value[4096]', use %4095s to prevent overflowing it.

VBOX: Update CPU VMX/SVM usage detection code with the latest error messages returned by VirtualBox 5.x

If an NVIDIA GPU is detected only by OpenCL we don't know how many
cores per proc it has.
Instead of assuming 8 (compute capability 1) assume 48 (CC 2).
We could assume 192 (CC 3) but better to err on the low side.

sched_util.h includes sched_util_basic.h and both are needed to build project specific daemons