Revert "ci: Exclude C++ sample and test builds on non-Linux hosts"

This reverts commit ac8acc2 because
the non-Linux C++ build issue has been fixed.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

.github/workflows/ci.yml

@@ -1588,18 +1588,12 @@ jobs:
         # Generate test list
         TEST_ARGS="
             -T ${ZEPHYR_ROOT}/samples/hello_world
+            -T ${ZEPHYR_ROOT}/samples/cpp/hello_world
             -T ${ZEPHYR_ROOT}/tests/lib/c_lib
+            -T ${ZEPHYR_ROOT}/tests/lib/cpp
             -T ${ZEPHYR_ROOT}/tests/lib/newlib
             "
 
-        # FIXME: Build C++ samples and tests only for Linux hosts because there
-        #        is a known issue causing link failures on non-Linux hosts (see
-        #        GitHub issue #760).
-        if [ "${{ runner.os }}" == "Linux" ]; then
-          TEST_ARGS+="-T ${ZEPHYR_ROOT}/samples/cpp/hello_world "
-          TEST_ARGS+="-T ${ZEPHYR_ROOT}/tests/lib/cpp "
-        fi
-
         # Run tests with twister
         TWISTER="${ZEPHYR_ROOT}/scripts/twister"
         ${TWISTER} -v -N --force-color --inline-logs --retry-failed 3 \