[compiler-rt] fix missing include for `abort` in `FuzzedDataProvider.h` (PR #113872)

[Petr Hosek via llvm-commits]

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@@ -13,6 +13,8 @@
 #ifndef LLVM_FUZZER_FUZZED_DATA_PROVIDER_H_
 #define LLVM_FUZZER_FUZZED_DATA_PROVIDER_H_
 
+#include <stdlib.h>
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petrhosek wrote:

We should be using `cstdlib` instead, see the other `c*` header inclusions below.

https://github.com/llvm/llvm-project/pull/113872