[libc][obvious] disable mprotect test under sanitizers

[michaelrj]

Summary

fixes a build failure in my previous patch

libc/test/src/sys/mman/linux/CMakeLists.txt

DEPENDS
     libc.include.errno
     libc.include.sys_mman
     libc.src.errno.errno
     libc.src.sys.mman.mmap
     libc.src.sys.mman.munmap
     libc.test.errno_setter_matcher
 )
 
+if (NOT LLVM_USE_SANITIZER)
   add_libc_unittest(
     mprotect_test
     SUITE
       libc_sys_mman_unittests
     SRCS
       mprotect_test.cpp
     DEPENDS
       libc.include.errno
       libc.include.sys_mman
       libc.include.signal
       libc.src.errno.errno
       libc.src.sys.mman.mmap
       libc.src.sys.mman.munmap
       libc.src.sys.mman.mprotect
       libc.test.errno_setter_matcher
   )
+endif()
 
 add_libc_unittest(
   madvise_test
   SUITE
     libc_sys_mman_unittests
   SRCS
   madvise_test.cpp
   DEPENDS

libc/test/src/sys/mman/linux/mprotect_test.cpp

 //===-- Unittests for mprotect --------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-#include "include/signal.h"
 #include "src/sys/mman/mmap.h"
 #include "src/sys/mman/mprotect.h"
 #include "src/sys/mman/munmap.h"
 #include "test/ErrnoSetterMatcher.h"
 #include "utils/UnitTest/Test.h"
 
 #include <errno.h>
+#include <signal.h>
 #include <sys/mman.h>
 
 using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
 using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
 
 TEST(LlvmLibcMProtectTest, NoError) {
   size_t alloc_size = 128;
   errno = 0;