Fix Clang tidy waring in ClatUtilsTest

Get rid of:
  ClatUtilsTest.cpp: warning: calling 'system' uses a command processor [cert-env33-c]

Test: builds
Bug: 130205154
Signed-off-by: Maciej Żenczykowski <maze@google.com
Change-Id: I8984bc34554ca27a580c19814ffab1e743bec127
diff --git a/server/ClatUtilsTest.cpp b/server/ClatUtilsTest.cpp
index 6be5529..2a869ba 100644
--- a/server/ClatUtilsTest.cpp
+++ b/server/ClatUtilsTest.cpp
@@ -101,11 +101,13 @@
 // NET_SCH_INGRESS is only enabled starting with 4.9-Q and as such we need
 // a separate way to test for this...
 int doKernelSupportsNetSchIngress(void) {
+    // NOLINTNEXTLINE(cert-env33-c)
     return system("zcat /proc/config.gz | egrep -q '^CONFIG_NET_SCH_INGRESS=[my]$'");
 }
 
 // NET_CLS_BPF is only enabled starting with 4.9-Q...
 int doKernelSupportsNetClsBpf(void) {
+    // NOLINTNEXTLINE(cert-env33-c)
     return system("zcat /proc/config.gz | egrep -q '^CONFIG_NET_CLS_BPF=[my]$'");
 }
 
@@ -113,6 +115,7 @@
 // due to missing binary or execution failure...
 TEST_F(ClatUtilsTest, KernelSupportsNetFuncs) {
     // Make sure the file is present and readable and decompressable.
+    // NOLINTNEXTLINE(cert-env33-c)
     ASSERT_EQ(W_EXITCODE(0, 0), system("zcat /proc/config.gz > /dev/null"));
 
     int v = doKernelSupportsNetSchIngress();