[PATCH] Use posix_madvise instead of madvise in kdelibs

[Michael Pyne]

Hi all,

I've attached a patch to use the posix_madvise function instead of madvise in 
kdelibs.  There are currently two places where madvise is used, in 
kdecore/sycoca/ksycoca.cpp and kdeui/util/kpixmapcache.cpp.  This is related 
to bug 195262 https://bugs.kde.org/show_bug.cgi?id=195262 (compilation errors 
on Solaris using madvise).

The problem on Solaris is that even for recent OpenSolaris releases the 
madvise function accepts a char* for the memory address instead of void*.  
posix_madvise standardized it to void*, which *is* supported by Solaris.  So 
the net effect is to remove some conditional compilation code.

I've also had to change the ConfigureChecks.cmake file.  I'm using 
check_symbol_exists instead of the check_function_exists because using 
posix_madvise requires including sys/mman.h.

The void* cast in ksycoca.cpp is still required due to sycoca declaring the 
pointer as const void*.

Please let me know if there are any objections (especially relating to BSDs, 
since I don't run those).

Regards,
 - Michael Pyne
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