[PATCH] Allow usage of union wait for wait() functions and macros

[Christian Franke]

The file include/sys/wait.h provides union wait but neither the wait() 
functions nor the W*() macros allow to actually use it. Compilation of 
cdrkit 1.1.11 fails because the configure check assumes that union wait 
is the status parameter type if its declaration exists.

The attached patch fixes this. It uses GCC extensions for C and 
overloading for C++. Works also with the old Cygwin gcc-3.

Christian

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