Avoid target_os and target_arch in some check-cfg tests

as they unnecessarily clutter the diagnostic output and make the
experience of adding a new target to the compiler more painful than
it should be.

target_os and target_arch are still being tested in the
well-known-values.rs test, but in one place.

tests/ui/check-cfg/compact-values.rs

@@ -8,7 +8,7 @@
 #[cfg(target(os = "linux", arch = "arm"))]
 pub fn expected() {}
 
-#[cfg(target(os = "linux", arch = "X"))]
+#[cfg(target(os = "linux", pointer_width = "X"))]
 //~^ WARNING unexpected `cfg` condition value
 pub fn unexpected() {}
 

tests/ui/check-cfg/compact-values.stderr

@@ -1,10 +1,10 @@
 warning: unexpected `cfg` condition value: `X`
   --> $DIR/compact-values.rs:11:28
    |
-LL | #[cfg(target(os = "linux", arch = "X"))]
-   |                            ^^^^^^^^^^
+LL | #[cfg(target(os = "linux", pointer_width = "X"))]
+   |                            ^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_arch` are: `aarch64`, `arm`, `avr`, `bpf`, `csky`, `hexagon`, `loongarch64`, `m68k`, `mips`, `mips32r6`, `mips64`, `mips64r6`, `msp430`, `nvptx64`, `powerpc`, `powerpc64`, `riscv32`, `riscv64`, `s390x`, `sparc`, `sparc64`, `wasm32`, `wasm64`, `x86`, `x86_64`
+   = note: expected values for `target_pointer_width` are: `16`, `32`, `64`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted

tests/ui/check-cfg/values-target-json.rs

@@ -10,10 +10,6 @@
 #[lang = "sized"]
 trait Sized {}
 
-#[cfg(target_os = "linuz")]
-//~^ WARNING unexpected `cfg` condition value
-fn target_os_linux_misspell() {}
-
 #[cfg(target_os = "linux")]
 fn target_os_linux() {}