fix(install_nfqws): preserve -std=gnu99 when stripping -s flag

sed pattern s/-s //g broke -std=gnu99 into td=gnu99. Use word-boundary regex to only remove the standalone strip flag.

install_nfqws.sh

@@ -116,7 +116,7 @@ fi
 # Verify the binary actually runs (catch segfaults early)
 if ! "$BUILD_DIR/zapret/nfq/nfqws" --help >/dev/null 2>&1; then
     echo "[!] nfqws segfaults with current flags. Rebuilding without strip..."
-    sed -i 's/-s //g; s/ -s//g' nfq/Makefile 2>/dev/null || true
+    sed -E -i 's/(^| )-s($| )/\1\2/g' nfq/Makefile 2>/dev/null || true
     make -C nfq clean && make -C nfq
     if [ ! -f "$BUILD_DIR/zapret/nfq/nfqws" ]; then
         echo "[!] nfqws binary not found after rebuild"