tests: fix lld unavailability in ppc64 for toolchains tests

tests/toolchains/main.fmf

@@ -13,9 +13,6 @@ adjust:
       - compiler-rt
       - lld
     when: "collection is not defined"
-  - require-:
-      - lld
-    when: collection is not defined and arch == s390x
 
   # Requirements for SCL-ized LLVM
   - require+:
@@ -23,17 +20,19 @@ adjust:
       - llvm-toolset-13.0-compiler-rt
       - llvm-toolset-13.0-lld
     when: "collection == llvm-toolset-13.0"
-  - require-:
-      - llvm-toolset-13.0-lld
-    when: collection == llvm-toolset-13.0 and arch == s390x
   - require+:
       - llvm-toolset-14.0-clang
       - llvm-toolset-14.0-compiler-rt
       - llvm-toolset-14.0-lld
     when: "collection == llvm-toolset-14.0"
+
+    # lld not supported in s390x or ppc64. If any lld package was added to
+    # requirements, remove it.
   - require-:
+      - lld
+      - llvm-toolset-13.0-lld
       - llvm-toolset-14.0-lld
-    when: collection == llvm-toolset-14.0 and arch == s390x
+    when: arch == s390x or arch == ppc64
 
   - environment+:
       CXXLIBS: "libc++"

tests/toolchains/test.sh

@@ -80,8 +80,10 @@ for compiler in clang clang++; do
                       args="$args -pthread"
                     fi
 
-                    # lld is not supported in s390x
+                    # lld is not supported in s390x and ppc64
-                    if [[ "$(uname -m)" = "s390x" && "$linker" = "lld" ]]; then
+                    if [[ "$(uname -m)" = "s390x" || "$(uname -m)" = "ppc64" ]] \
+                        && [[ "$linker" = "lld" ]];
+                    then
                       continue
                     fi