Add -mxgot flag to td_scheme on MIPS64

This fixes "relocation truncated to fit ..." error on final linking. It should
not introduce a lot of overhead since the code is used only in network
communications.

This errors appears sometimes and I do not know exact conditions, I think it is
related to large size of an object file with the schema.

More docs see at https://gcc.gnu.org/onlinedocs/gcc/MIPS-Options.html#index-mxgot-1

Telegram/cmake/td_scheme.cmake

@@ -33,3 +33,12 @@ PUBLIC
     desktop-app::lib_base
     desktop-app::lib_tl
 )
+
+if (CMAKE_SYSTEM_PROCESSOR STREQUAL "mips64")
+    # Sometimes final linking may fail with error "relocation truncated to fit"
+    # due to large scheme size.
+    target_compile_options(td_scheme
+    PRIVATE
+        -mxgot
+    )
+endif()