Fix test build on Linux: add stdint.h and link libm

- test_ppbloom.c: add missing #include <stdint.h> for uint8_t
- test_json: link against libm for pow() used in json.c

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/CMakeLists.txt

@@ -34,7 +34,7 @@ ss_add_test(test_utils
 # test_json - standalone json parser
 ss_add_test(test_json
     "test_json.c;${PROJECT_SOURCE_DIR}/src/json.c"
-    "")
+    "m")
 
 # test_netutils - needs cork for ip address parsing
 set(TEST_NETUTILS_LIBS

tests/test_ppbloom.c

@@ -3,6 +3,7 @@
 #endif
 
 #include <assert.h>
+#include <stdint.h>
 #include <string.h>
 #include <stdlib.h>