Update relic to 9206ae50b667de160fcc385ba3dc2c920143ab0a

The diff contains:
- a lot of changes that concern parts of the library we don't use (other curves a la BN, BLS24-X, BLS12-383 ...), integer protocols (ETRS), field extension machinery ...
- otherwise irrelevant changes, e.g. CI/CD
- some memory bug fixing

[Full Changeset](https://github.com/relic-toolkit/relic/compare/7a9bba7f..9206ae5)

**Fixed bugs:**

- Unexpected failure of ep2\_mul\[\_lwnaf\] above the prime group order [\#64](relic-toolkit/relic#64)

**Closed issues:**

- Other way to construct towered extension fields [\#203](relic-toolkit/relic#203)
- blake2.h:101:5: error: size of array element is not a multiple of its alignment [\#202](relic-toolkit/relic#202)
- ECIES 160bit [\#201](relic-toolkit/relic#201)
- Compilation with "ARITH gmp" fails [\#200](relic-toolkit/relic#200)
- Support for armv8-a ? [\#198](relic-toolkit/relic#198)
- Function name bn\_init conflicts with OpenSSL when used in tandem [\#196](relic-toolkit/relic#196)
- 16-bit MSP430 [\#193](relic-toolkit/relic#193)
- Modular exponentiation returns 1 if exponent is 0 and modulo is 1 [\#185](relic-toolkit/relic#185)
- Compilation of RELIC with bls12-446 and bls12-455 fails [\#182](relic-toolkit/relic#182)
- test\_bn fails with BLS12-381 preset [\#181](relic-toolkit/relic#181)
- \[BUG\] undefined reference to `bench_init', `bench\_clean' [\#180](relic-toolkit/relic#180)
- Tests FTBFS because of missing symbol in header [\#179](relic-toolkit/relic#179)
- Builds are broken [\#178](relic-toolkit/relic#178)
- compile error  inlining failed in call to always\_inline ‘\_mm\_alignr\_epi8’ on unbantu20.04 gcc9 [\#177](relic-toolkit/relic#177)
- bn\_write\_str buffer overflow [\#176](relic-toolkit/relic#176)
- ECDSA verify succeeds when it should fail [\#175](relic-toolkit/relic#175)
- ec\_mul\_gen hangs with curve SECG\_K256 [\#174](relic-toolkit/relic#174)
- Wrong square root computation [\#173](relic-toolkit/relic#173)
- Out-of-bounds read via bn\_sqr\_basic [\#172](relic-toolkit/relic#172)
- OSS-Fuzz integration [\#171](relic-toolkit/relic#171)
- Building Relic with Curve NIST\_P256 throws FATAL ERROR in relic\_fp\_prime.c:120 [\#170](relic-toolkit/relic#170)
- Compressing \(packing\) a point to binary array does not comply with X9.62 standard [\#169](relic-toolkit/relic#169)
-  ‘ctx\_t’ {aka ‘struct \_ctx\_t’} has no member named ‘total’ [\#168](relic-toolkit/relic#168)
- relic does not work with C++ [\#167](relic-toolkit/relic#167)
- Memory leak in ep2\_curve\_init/clean with ALLOC=DYNAMIC [\#166](relic-toolkit/relic#166)
- \*\_is\_valid\(\) functions produce false negative for not normalized points [\#147](relic-toolkit/relic#147)
- Bench and Test doesnt build [\#122](relic-toolkit/relic#122)

**Merged pull requests:**

- Add pairing delegation protocols [\#199](relic-toolkit/relic#199) ([dfaranha](https://github.com/dfaranha))
- Fix support for Win64/MSVC targets. [\#197](relic-toolkit/relic#197) ([dfaranha](https://github.com/dfaranha))
- Simplify generator getting for Gt. [\#194](relic-toolkit/relic#194) ([luozejiaqun](https://github.com/luozejiaqun))
- cmake: Always use user defined CFLAGS, not only for release builds [\#187](relic-toolkit/relic#187) ([xdustinface](https://github.com/xdustinface))
- Fix MinGW build [\#186](relic-toolkit/relic#186) ([xdustinface](https://github.com/xdustinface))
- Remove debug printf in bn\_mxp\_slide [\#184](relic-toolkit/relic#184) ([guidovranken](https://github.com/guidovranken))
- Remove ALLOC = STACK to simplify memory allocation. [\#183](relic-toolkit/relic#183) ([dfaranha](https://github.com/dfaranha))
- Update relic\_alloc.h [\#165](relic-toolkit/relic#165) ([aguycalled](https://github.com/aguycalled))
- Add correct support for FreeBSD and NetBSD [\#164](relic-toolkit/relic#164) ([hoffmang9](https://github.com/hoffmang9))