Do some minor reformatting of 'extern "C"' use throughout.

* autoload.cc (GetSystemTimes): Define new autoload function.
* fhandler_proc.cc (proc_listing): Add cpuinfo and partitions entries.
(fhandler_proc::fill_filebuf): Add PROC_CPUINFO and PROC_PARTITIONS cases.
(format_proc_uptime): Use GetSystemTimes if available.
(read_value): New macro.
(print): New macro.
(cpuid): New function.
(can_set_flag): New function.
(format_proc_cpuinfo): New function.
(format_proc_partitions): New function.

winsup/cygwin/poll.cc

@@ -26,8 +26,7 @@
 #include "cygheap.h"
 #include "sigproc.h"
 
-extern "C"
-int
+extern "C" int
 poll (struct pollfd *fds, unsigned int nfds, int timeout)
 {
   int max_fd = 0;