Update falcosecurity-libs to latest (0.20.0).

* cmake/modules/falcosecurity-libs.cmake: Require falcosecurity-libs
0.20.0; update version string and checksum.
* userspace/chisel/chisel_api.cpp (lua_cbacks::get_thread_table_int):
Adjust for falcosecurity-libs commit
417e523399796d7290a479fd55988e62e80fc97e ("drop user and group infos
embedded in threadinfo.").

Fixes: #2132

cmake/modules/falcosecurity-libs.cmake

@@ -22,7 +22,7 @@ option(USE_BUNDLED_FALCOSECURITY_LIBS
 
 if(NOT USE_BUNDLED_FALCOSECURITY_LIBS)
     find_package(PkgConfig REQUIRED)
-    pkg_check_modules(LIBSINSP REQUIRED IMPORTED_TARGET libsinsp)
+    pkg_check_modules(LIBSINSP REQUIRED IMPORTED_TARGET libsinsp>=0.20.0)
     message(STATUS "Found libsinsp:
   include: ${LIBSINSP_INCLUDE_DIRS}
   lib: ${LIBSINSP_LIBRARIES}
@@ -47,8 +47,8 @@ else()
   # In case you want to test against another falcosecurity/libs version (or branch, or commit) just pass the variable -
   # ie., `cmake -DFALCOSECURITY_LIBS_VERSION=dev ..`
   if(NOT FALCOSECURITY_LIBS_VERSION)
-    set(FALCOSECURITY_LIBS_VERSION "0.19.0")
-    set(FALCOSECURITY_LIBS_CHECKSUM "SHA256=77c38b45c8b29c4da4f8ce49da68278b347a403ff1075307ff0cf540596303ac")
+    set(FALCOSECURITY_LIBS_VERSION "0.20.0")
+    set(FALCOSECURITY_LIBS_CHECKSUM "SHA256=4ae6ddb42a1012bacd88c63abdaa7bd27ca0143c4721338a22c45597e63bc99d")
   endif()
 
   # cd /path/to/build && cmake /path/to/source

userspace/chisel/chisel_api.cpp

@@ -842,10 +842,10 @@ int lua_cbacks::get_thread_table_int(lua_State *ls, bool include_fds, bool bareb
 			lua_pushnumber(ls, (uint32_t)tinfo.m_fdlimit);
 			lua_settable(ls, -3);
 			lua_pushliteral(ls, "uid");
-			lua_pushnumber(ls, (uint32_t)tinfo.m_user.uid());
+			lua_pushnumber(ls, (uint32_t)tinfo.m_uid);
 			lua_settable(ls, -3);
 			lua_pushliteral(ls, "gid");
-			lua_pushnumber(ls, (uint32_t)tinfo.m_group.gid());
+			lua_pushnumber(ls, (uint32_t)tinfo.m_gid);
 			lua_settable(ls, -3);
 			lua_pushliteral(ls, "nchilds");
 			lua_pushnumber(ls, (uint32_t)tinfo.get_num_not_leader_threads());
@@ -872,8 +872,9 @@ int lua_cbacks::get_thread_table_int(lua_State *ls, bool include_fds, bool bareb
 			//
 			// Extract the user name
 			//
+			auto user = tinfo.get_user();
 			lua_pushliteral(ls, "username");
-			lua_pushstring(ls, tinfo.m_user.name().c_str());
+			lua_pushstring(ls, user->name);
 			lua_settable(ls, -3);
 
 			//