Add test for use of lldb inside venv

For https://bugzilla.redhat.com/show_bug.cgi?id=2361538.

tests/lldb/python-embedded-interpreter/test.sh

@@ -7,15 +7,24 @@ rpm -q --requires "$LLDB_PACKAGE" | grep "python3\(\.12\)\?-lldb"
 # Sanity test
 g++ -g test.cpp
 
-lldb -b -o 'breakpoint set --file test.cpp --line 8' \
-  -o run -o 'p i' -o 'p f'\
-  -- a.out | tee lldb.log
+run_test() {
+    lldb -b -o 'breakpoint set --file test.cpp --line 8' \
+      -o run -o 'p i' -o 'p f'\
+      -- a.out | tee lldb.log
 
-# shellcheck disable=SC2016
-test "$(grep -c \
-    -e '(int) \($0 = \)\?1' \
-    -e '(float) \($1 = \)\?1' \
-    lldb.log \
-  )" -eq 2
+    # shellcheck disable=SC2016
+    test "$(grep -c \
+        -e '(int) \($0 = \)\?1' \
+        -e '(float) \($1 = \)\?1' \
+        lldb.log \
+      )" -eq 2
 
-rm lldb.log
+    rm lldb.log
+}
+
+run_test
+
+# Now try again inside virtualenv
+python -m venv venv
+source ./venv/bin/activate
+run_test