fix clippy lint for missing transmute annotations (#196)

Author: micahrj

src/gl/win.rs

@@ -160,6 +160,7 @@ impl GlContext {
             let symbol = CString::new("wglCreateContextAttribsARB").unwrap();
             let addr = wglGetProcAddress(symbol.as_ptr());
             if !addr.is_null() {
+                #[allow(clippy::missing_transmute_annotations)]
                 Some(std::mem::transmute(addr))
             } else {
                 None
@@ -171,6 +172,7 @@ impl GlContext {
             let symbol = CString::new("wglChoosePixelFormatARB").unwrap();
             let addr = wglGetProcAddress(symbol.as_ptr());
             if !addr.is_null() {
+                #[allow(clippy::missing_transmute_annotations)]
                 Some(std::mem::transmute(addr))
             } else {
                 None
@@ -182,6 +184,7 @@ impl GlContext {
             let symbol = CString::new("wglSwapIntervalEXT").unwrap();
             let addr = wglGetProcAddress(symbol.as_ptr());
             if !addr.is_null() {
+                #[allow(clippy::missing_transmute_annotations)]
                 Some(std::mem::transmute(addr))
             } else {
                 None

src/gl/x11.rs

@@ -91,6 +91,7 @@ impl GlContext {
                 if addr.is_null() {
                     return Err(GlError::CreationFailed(CreationFailedError::GetProcAddressFailed));
                 } else {
+                    #[allow(clippy::missing_transmute_annotations)]
                     std::mem::transmute(addr)
                 }
             };
@@ -101,6 +102,7 @@ impl GlContext {
                 if addr.is_null() {
                     return Err(GlError::CreationFailed(CreationFailedError::GetProcAddressFailed));
                 } else {
+                    #[allow(clippy::missing_transmute_annotations)]
                     std::mem::transmute(addr)
                 }
             };

src/win/drop_target.rs

@@ -47,6 +47,8 @@ const DROP_PTR: unsafe extern "system" fn(
     pt: POINTL,
     pdwEffect: *mut DWORD,
 ) -> HRESULT = DropTarget::drop;
+
+#[allow(clippy::missing_transmute_annotations)]
 const DROP_TARGET_VTBL: IDropTargetVtbl = IDropTargetVtbl {
     parent: IUnknownVtbl {
         QueryInterface: DropTarget::query_interface,