Remove size assertion

This was overzealous according to @FractalFir and I am hitting it as well.

Author: LegNeato

crates/cust/src/module.rs

@@ -360,10 +360,6 @@ impl Module {
 
     /// Get a reference to a global symbol, which can then be copied to/from.
     ///
-    /// # Panics:
-    ///
-    /// This function panics if the size of the symbol is not the same as the `mem::sizeof<T>()`.
-    ///
     /// # Examples
     ///
     /// ```
@@ -397,7 +393,6 @@ impl Module {
                 name.as_ptr(),
             )
             .to_result()?;
-            assert_eq!(size, mem::size_of::<T>());
             Ok(Symbol {
                 ptr,
                 module: PhantomData,