configure: Add a check for sys/ucontext.h and include it where appropriate.
tree9cbfd0c10891adb6cec5d90b73f2bf6b25c55954
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drwxr-xr-x - dlls
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drwxr-xr-x - fonts
drwxr-xr-x - include
drwxr-xr-x - libs
drwxr-xr-x - loader
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drwxr-xr-x - programs
drwxr-xr-x - server
drwxr-xr-x - tools