Merge bitcoin-core/secp256k1#1146: ci: prevent "-v/--version: not found" irrelevant error

49ae843592 ci: mostly prevent "-v/--version: not found" irrelevant error (Jonas Nick)

Pull request description:

ACKs for top commit:
  real-or-random:
    ACK 49ae843592

Tree-SHA512: 2e048b037826dff372e26103f198e0d490494e7909d17d8632b51f6d9e0629b51bcd0b55b65b2c21d63d522394ccfed481ce126cea165c087df670556bc8ccf6

ci/cirrus.sh

@@ -16,9 +16,16 @@ esac
 
 env >> test_env.log
 
-$CC -v || true
-valgrind --version || true
-$WRAPPER_CMD --version || true
+if [ -n "$CC" ]; then
+    # The MSVC compiler "cl" doesn't understand "-v"
+    $CC -v || true
+fi
+if [ "$WITH_VALGRIND" = "yes" ]; then
+    valgrind --version
+fi
+if [ -n "$WRAPPER_CMD" ]; then
+    $WRAPPER_CMD --version
+fi
 
 ./autogen.sh