cross-compile-i686: Adjust metadata

compiler-rt.i686 packages are not shipped in RHEL or CentOS, disable
the test in those distros

cross-compile-i686/main.fmf

@@ -13,26 +13,13 @@ adjust:
     because: "Test applicable only on x86_64 arch"
     when: arch != x86_64
 
+  - enabled: false
+    because: "compiler-rt.i686 packages not shipped in RHEL/CentOS"
+    when: distro == rhel or distro == centos
+
   - require+:
       - clang
       - compiler-rt.x86_64
       - compiler-rt.i686
       - glibc-devel.i686
     when: collection is not defined
-
-  # Requirements for SCL-ized LLVM
-  - require+:
-      - llvm-toolset-13.0-clang
-      - llvm-toolset-13.0-compiler-rt
-      - llvm-toolset-13.0-compiler-rt.i686
-    when: collection == llvm-toolset-13.0
-  - require+:
-      - llvm-toolset-14.0-clang
-      - llvm-toolset-14.0-compiler-rt
-      - llvm-toolset-14.0-compiler-rt.i686
-    when: collection == llvm-toolset-14.0
-  - require+:
-      - llvm-toolset-15.0-clang
-      - llvm-toolset-15.0-compiler-rt
-      - llvm-toolset-15.0-compiler-rt.i686
-    when: collection == llvm-toolset-15.0