Update MSRV in .clippy.toml and silence new Windows warnings. (#436)

.clippy.toml

@@ -1 +1 @@
-msrv = "1.38"
+msrv = "1.56"

src/windows.rs

@@ -26,6 +26,7 @@ use core::mem::MaybeUninit;
 // bcryptprimitives.dll lacks an import library, we use the windows-targets
 // crate to link to it.
 windows_targets::link!("bcryptprimitives.dll" "system" fn ProcessPrng(pbdata: *mut u8, cbdata: usize) -> BOOL);
+#[allow(clippy::upper_case_acronyms)]
 pub type BOOL = i32;
 pub const TRUE: BOOL = 1i32;
 

src/windows7.rs

@@ -19,6 +19,7 @@ extern "system" {
     #[link_name = "SystemFunction036"]
     fn RtlGenRandom(randombuffer: *mut c_void, randombufferlength: u32) -> BOOLEAN;
 }
+#[allow(clippy::upper_case_acronyms)]
 type BOOLEAN = u8;
 const TRUE: BOOLEAN = 1u8;