Add GetActiveProcessorCount and process attributes

Author: ChrisDenton

Diff for: library/std/src/sys/windows/c/windows_sys.lst

@@ -2480,6 +2480,7 @@ Windows.Win32.System.SystemInformation.GetSystemTimeAsFileTime
 Windows.Win32.System.SystemInformation.GetWindowsDirectoryW
 Windows.Win32.System.SystemInformation.PROCESSOR_ARCHITECTURE
 Windows.Win32.System.SystemInformation.SYSTEM_INFO
+Windows.Win32.System.SystemServices.ALL_PROCESSOR_GROUPS
 Windows.Win32.System.SystemServices.DLL_PROCESS_DETACH
 Windows.Win32.System.SystemServices.DLL_THREAD_DETACH
 Windows.Win32.System.SystemServices.EXCEPTION_MAXIMUM_PARAMETERS
@@ -2512,6 +2513,7 @@ Windows.Win32.System.Threading.DeleteProcThreadAttributeList
 Windows.Win32.System.Threading.DETACHED_PROCESS
 Windows.Win32.System.Threading.ExitProcess
 Windows.Win32.System.Threading.EXTENDED_STARTUPINFO_PRESENT
+Windows.Win32.System.Threading.GetActiveProcessorCount
 Windows.Win32.System.Threading.GetCurrentProcess
 Windows.Win32.System.Threading.GetCurrentProcessId
 Windows.Win32.System.Threading.GetCurrentThread

Diff for: library/std/src/sys/windows/c/windows_sys.rs

@@ -220,6 +220,10 @@ extern "system" {
     pub fn FreeEnvironmentStringsW(penv: PCWSTR) -> BOOL;
 }
 #[link(name = "kernel32")]
+extern "system" {
+    pub fn GetActiveProcessorCount(groupnumber: u16) -> u32;
+}
+#[link(name = "kernel32")]
 extern "system" {
     pub fn GetCommandLineW() -> PCWSTR;
 }
@@ -844,6 +848,7 @@ impl ::core::clone::Clone for ADDRINFOA {
 pub const AF_INET: ADDRESS_FAMILY = 2u16;
 pub const AF_INET6: ADDRESS_FAMILY = 23u16;
 pub const AF_UNSPEC: ADDRESS_FAMILY = 0u16;
+pub const ALL_PROCESSOR_GROUPS: u32 = 65535u32;
 #[repr(C)]
 pub union ARM64_NT_NEON128 {
     pub Anonymous: ARM64_NT_NEON128_0,