Compile fix on platforms with missing pthread_rwlock_t.
Fix compilation on platforms with missing pthread_rwlock_t implementation by replacing it with pthread_mutex_t. An example of such platform can be Android OS 2.0 - 2.1, API level 5 (Eclair), Android NDK platform - android-5 where pthread_rwlock_t is not implemented and is missing in pthread.h. In case of missing pthread_rwlock_t implementation CRYPTO_RWLOCK will work as exclusive lock in write-only mode of pthread_rwlock_t lock. The implementation based on pthread_mutex_t must be using PTHREAD_MUTEX_RECURSIVE mode to be compatible with recursive behavior of pthread_rwlock_rdlock. Reviewed-by: NRich Salz <rsalz@openssl.org> Reviewed-by: NRichard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1981)
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