contrib: run test-symbol check for RISCV

Now that we are using Focal for Gitian building (glibc 2.31), we can
user a newer introduced  symbol, and include RISCV in this test.

ci/test/00_setup_env_native_multiprocess.sh

@@ -13,3 +13,4 @@ export DEP_OPTS="MULTIPROCESS=1"
 export GOAL="install"
 export BITCOIN_CONFIG="--with-boost-process"
 export TEST_RUNNER_ENV="BITCOIND=bitcoin-node"
+export RUN_SECURITY_TESTS="true"

ci/test/00_setup_env_native_qt5.sh

@@ -11,7 +11,6 @@ export DOCKER_NAME_TAG=ubuntu:18.04  # Check that bionic gcc-7 can compile our c
 export PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools libdbus-1-dev libharfbuzz-dev"
 export DEP_OPTS="NO_QT=1 NO_UPNP=1 NO_NATPMP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1"
 export TEST_RUNNER_EXTRA="--previous-releases --coverage --extended --exclude feature_dbcrash"  # Run extended tests so that coverage does not fail, but exclude the very slow dbcrash
-export RUN_SECURITY_TESTS="true"
 export RUN_UNIT_TESTS_SEQUENTIAL="true"
 export RUN_UNIT_TESTS="false"
 export GOAL="install"

contrib/devtools/test-symbol-check.py

@@ -23,29 +23,26 @@ class TestSymbolChecks(unittest.TestCase):
         executable = 'test1'
         cc = 'gcc'
 
-        # there's no way to do this test for RISC-V at the moment; bionic's libc is 2.27
-        # and we allow all symbols from 2.27.
-        if 'riscv' in get_machine(cc):
-            self.skipTest("test not available for RISC-V")
-
-        # memfd_create was introduced in GLIBC 2.27, so is newer than the upper limit of
-        # all but RISC-V but still available on bionic
+        # renameat2 was introduced in GLIBC 2.28, so is newer than the upper limit
+        # of glibc for all platforms
         with open(source, 'w', encoding="utf8") as f:
             f.write('''
                 #define _GNU_SOURCE
-                #include <sys/mman.h>
+                #include <stdio.h>
+                #include <linux/fs.h>
 
-                int memfd_create(const char *name, unsigned int flags);
+                int renameat2(int olddirfd, const char *oldpath,
+                    int newdirfd, const char *newpath, unsigned int flags);
 
                 int main()
                 {
-                    memfd_create("test", 0);
+                    renameat2(0, "test", 0, "test_", RENAME_EXCHANGE);
                     return 0;
                 }
         ''')
 
         self.assertEqual(call_symbol_check(cc, source, executable, []),
-                (1, executable + ': symbol memfd_create from unsupported version GLIBC_2.27\n' +
+                (1, executable + ': symbol renameat2 from unsupported version GLIBC_2.28\n' +
                     executable + ': failed IMPORTED_SYMBOLS'))
 
         # -lutil is part of the libc6 package so a safe bet that it's installed