cargo: workaround for successful compilation...

for aarch64 musl target.

Signed-off-by: Diana Popa <[email protected]>

Author: dianpopa

.cargo/config

@@ -1,2 +1,8 @@
 [build]
 target = "x86_64-unknown-linux-musl"
+
+[target.aarch64-unknown-linux-musl]
+# On aarch64 musl depends on some libgcc functions (i.e `__addtf3` and other `*tf3` functions) for logic that uses
+# long double. Such functions are not builtin in the rust compiler, so we need to get them from libgcc.
+# No need for the `crt_static` flag as rustc appends it by default.
+rustflags = [ "-C", "link-arg=-lgcc" ]