Rollup merge of #49618 - pftbest:fix_warning, r=SimonSapin
Rollup merge of #49618 - pftbest:fix_warning, r=SimonSapin

Fix build error when compiling libcore for 16bit targets

Fixes #49617

cc @SimonSapin

graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust