integration-test-suite: Update required packages in Fedora

New tests were added upstream: unwind.cpp, hello.mlir and
minimal_mlir_cmake.txt -- these require extra packages to
run properly.

Some extra adjustments were done to handle the unavailability
of libcxx and libunwind in RHEL and CentOS

integration-test-suite/main.fmf

@@ -85,15 +85,20 @@ adjust:
     when: arch == s390x
 
   # libcxx shall be required in Fedora, it's not shipped with RHEL.
+  # Same applies for mlir and libunwind.
   - require+:
       - libcxx-devel
+      - libcxx-static
+      - mlir-devel
+      - llvm-libunwind-devel
     when: "distro == fedora"
-    because: testing against libcxx package in Fedora
+    because: Require extra packages supported in Fedora
 
   - environment+:
-      CMAKE_CXXLIB: "-DENABLE_LIBCXX=OFF"
+      CMAKE_CXXLIB: "-DENABLE_LIBCXX=OFF -DENABLE_STATIC_LIBCXX=OFF"
+      CMAKE_LIBUNWIND: "-DENABLE_LIBUNWIND=OFF"
     when: >-
       distro == centos
       or distro == rhel
-    because: libcxx is not shipped with neither Centos nor RHEL
+    because: libcxx and libunwind is not shipped with neither Centos nor RHEL
 extra-nitrate: TC#0614094

integration-test-suite/test.sh

@@ -33,7 +33,7 @@ cd $(mktemp -d -p /var/tmp)
 git clone $repo_url
 cd llvm-toolchain-integration-test-suite
 mkdir _build && cd _build
-cmake .. ${CMAKE_CXXLIB:-}
+cmake .. ${CMAKE_CXXLIB:-} ${CMAKE_LIBUNWIND:-}
 # Do not run with make as it will return 2 in case of failures, which will be
 # reported by tmt as error instead failure. Run with lit so it returns 1.
 lit --show-unsupported --show-xfail -v tests