[rand] Disable RandTest.Fork on Fuchsia

This CL omits the RandTest.Fork unit test on Fuchsia, which does not
have fork().  Fuchsia has a bug (SEC-140) to create a suitable
replacement test.

Change-Id: Ic42f9149c24dc7321bfac1c718e9ecbb4a18b5d0
Reviewed-on: https://boringssl-review.googlesource.com/c/32504
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

crypto/rand_extra/rand_test.cc

diff --git a/crypto/rand_extra/rand_test.cc b/crypto/rand_extra/rand_test.cc
index d0a7e40..9ee3f26 100644
--- a/crypto/rand_extra/rand_test.cc
+++ b/crypto/rand_extra/rand_test.cc
@@ -51,7 +51,7 @@
 }
 
 #if !defined(OPENSSL_WINDOWS) && !defined(OPENSSL_IOS) && \
-    !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
+    !defined(OPENSSL_FUCHSIA) && !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
 static bool ForkAndRand(bssl::Span<uint8_t> out) {
   int pipefds[2];
   if (pipe(pipefds) < 0) {
@@ -146,7 +146,7 @@
   EXPECT_NE(Bytes(buf3), Bytes(kZeros));
 }
 #endif  // !OPENSSL_WINDOWS && !OPENSSL_IOS &&
-        // !BORINGSSL_UNSAFE_DETERMINISTIC_MODE
+        // !OPENSSL_FUCHSIA && !BORINGSSL_UNSAFE_DETERMINISTIC_MODE
 
 #if defined(OPENSSL_THREADS)
 static void RunConcurrentRands(size_t num_threads) {