Added lcc support release snippet

docs/markdown/snippets/lcc.md

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+## Support for lcc compiler for e2k (Elbrus) architecture
+
+In this version, a support for lcc compiler for Elbrus processors
+based on [e2k microarchitecture](https://en.wikipedia.org/wiki/Elbrus_2000)
+has been added.
+
+Examples of such CPUs:
+* [Elbrus-8S (Эльбрус-8С)](https://en.wikipedia.org/wiki/Elbrus-8S);
+* Elbrus-4S (Эльбрус-4С);
+* [Elbrus-2S+ (Эльбрус-2С+)](https://en.wikipedia.org/wiki/Elbrus-2S%2B).
+
+Such compiler have a similar behavior as gcc (basic option compatibility),
+but, in is not strictly compatible with gcc as of current version.
+
+Major differences as of version 1.21.22:
+* it does not support LTO and PCH;
+* it suffers from the same dependency file creation error as icc;
+* it has minor differences in output, especially version output;
+* it differently reacts to lchmod() detection;
+* some backend messages are produced in ru_RU.KOI8-R even if LANG=C;
+* its preprocessor treats some characters differently.
+
+So every noted difference is properly handled now in meson.