Fix assertions

Author: mattgodbolt

build/build.sh

@@ -359,7 +359,7 @@ mlir-*)
             LLVM_EXPERIMENTAL_TARGETS_TO_BUILD="WebAssembly"
         elif [[ $MAJOR -le 21 ]]; then
             PATCHES_TO_APPLY+=("${ROOT}/patches/ce-debug-clang-13.patch")
-            LLVM_EXPERIMENTAL_TARGETS_TO_BUILD="M68K;WebAssembly"
+            LLVM_EXPERIMENTAL_TARGETS_TO_BUILD="M68k;WebAssembly"
         else
             PATCHES_TO_APPLY+=("${ROOT}/patches/ce-debug-clang-trunk.patch")
             LLVM_EXPERIMENTAL_TARGETS_TO_BUILD="M68k;WebAssembly"