Linux compilation: Enable some warnings.
We had turned off all warnings in Linux kernel compilation because otherwise one drowned in errors from the Linux header files, such as "automatic conversion from void * to char *" and such. But there is a way to get user warnings without drowning in kernel warnings: mark the kernel header files as "system" header files, with -isystem. So do that; and update configury to control warning options more carefully. Signed-off-by: Eddie Kohler <firstname.lastname@example.org>
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