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test/fuzz: update compiler and library flags

Clang compiler is linking by default against libc++ rather than
libstdc++, which the code seems to be built against.

The patch adds "-stdlib=libstdc++" that is required by build on
OSS Fuzz and also removes dirty hacks in a build script [2][3]
and allows to switch to a static build in OSS Fuzz.

1. https://libcxx.llvm.org/docs/UsingLibcxx.html
2. https://github.com/google/oss-fuzz/commit/92d4e951c
3. https://github.com/google/oss-fuzz/commit/7a6315db9
4. https://github.com/google/oss-fuzz/pull/12322

NO_CHANGELOG=testing
NO_DOC=testing

(cherry picked from commit 79737d9d1)

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