Vendor dependencies for 0.3.0 release

vendor/getrandom-0.2.16/src/solid.rs

@@ -0,0 +1,18 @@
+//! Implementation for SOLID
+use crate::Error;
+use core::{mem::MaybeUninit, num::NonZeroU32};
+
+extern "C" {
+    pub fn SOLID_RNG_SampleRandomBytes(buffer: *mut u8, length: usize) -> i32;
+}
+
+pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
+    let ret = unsafe { SOLID_RNG_SampleRandomBytes(dest.as_mut_ptr() as *mut u8, dest.len()) };
+    if ret >= 0 {
+        Ok(())
+    } else {
+        // ITRON error numbers are always negative, so we negate it so that it
+        // falls in the dedicated OS error range (1..INTERNAL_START).
+        Err(NonZeroU32::new((-ret) as u32).unwrap().into())
+    }
+}