spurious CI error for MSVC

[ehuss]

There have been a few instances of this error happening on CI:

= note: LINK : fatal error LNK1201: error writing to program database 'D:\a\rust\rust\build\i686-pc-windows-msvc\test\run-make-fulldeps\extern-flag-fun\extern-flag-fun\foo.pdb'; check for insufficient disk space, invalid path, or insufficient privilege

Or some variant of that. See:

• Revert 78373 ("dont leak return value after panic in drop") #81257 (comment)
• Remove usages of expr_method_call in derive(Ord,PartialOrd,RustcEncode,RustcDecode) #81411 (comment)
• Box Item::Attributes #80802 (comment)
• remove allow(incomplete_features) from std #80591 (comment)
• Remove pointer comparison from slice equality #80209 (comment)
• Revert "cg_llvm: fewer_names in uncached_llvm_type" #80122 (comment)
• Use tcx.symbol_name when determining clashing extern declarations. #80009 (comment)
• Fix overflow when converting ZST Vec to VecDeque #80003 (comment)

(and probably many more)

[kennytm]

Not just i686.

• Make RawVec private to alloc #90542 (comment)
• Change paths for dist command to match the components they generate #90684 (comment)