[PATCH] selftests/timers: Guard LONG_MAX / LONG_MIN defines

[Edward Liaw <edliaw@google.com>]

Add ifndef guards around LONG_MAX / LONG_MIN defines. When building with
Android bionic, these macros are redefined because bionic's time.h will
include linux/time.h, which includes limit.h.

INFO: From Compiling common/tools/testing/selftests/timers/valid-adjtimex.c:
common/tools/testing/selftests/timers/valid-adjtimex.c:107:9: warning: 'LONG_MAX' macro redefined [-Wmacro-redefined]
  107 | #define LONG_MAX (~0UL>>1)
      |         ^
prebuilts/clang/host/linux-x86/clang-r522817/lib/clang/18/include/limits.h:47:9: note: previous definition is here
   47 | #define LONG_MAX  __LONG_MAX__
      |         ^
common/tools/testing/selftests/timers/valid-adjtimex.c:108:9: warning: 'LONG_MIN' macro redefined [-Wmacro-redefined]
  108 | #define LONG_MIN (-LONG_MAX - 1)
      |         ^
prebuilts/clang/host/linux-x86/clang-r522817/lib/clang/18/include/limits.h:52:9: note: previous definition is here
   52 | #define LONG_MIN  (-__LONG_MAX__ -1L)
      |         ^

Signed-off-by: Edward Liaw <edliaw@google.com>
---
 tools/testing/selftests/timers/valid-adjtimex.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/timers/valid-adjtimex.c b/tools/testing/selftests/timers/valid-adjtimex.c
index d500884801d8..3d9f1baff86e 100644
--- a/tools/testing/selftests/timers/valid-adjtimex.c
+++ b/tools/testing/selftests/timers/valid-adjtimex.c
@@ -102,8 +102,12 @@ long outofrange_freq[NUM_FREQ_OUTOFRANGE] = {
 	 1000 * SHIFTED_PPM,
 };
 
+#ifndef LONG_MAX
 #define LONG_MAX (~0UL>>1)
+#endif
+#ifndef LONG_MIN
 #define LONG_MIN (-LONG_MAX - 1)
+#endif
 
 long invalid_freq[NUM_FREQ_INVALID] = {
 	LONG_MAX,
-- 
2.45.1.288.g0e0cd299f1-goog