[libFuzzer] temporarily disable a test on windows, where there is no memmem in the usual place
+# Temporary disable this test on non-linux: looks like there is no memmem on windows.
+REQUIRES: linux
RUN: %cpp_compiler -O2 %S/MagicSeparatorTest.cpp -o %t-MagicSeparatorTest
RUN: not %run %t-MagicSeparatorTest -use_value_profile=1 -seed=1 -runs=100000000 -max_len=10
