Bump rr (#5202)

* Bump rr

Includes an assortment of fixes we've seen for rr CI issues, but does not yet include the big syscallbuf refactor that is currently pending, so this should be relatively safe to do.

* Let's try the aarch64 build also to see what happens

* Drop aarch64 march

* Try gcc 10 for `-moutline-atomics`

* Split capnproto dependency, fix aarch64 errors

R/rr/build_tarballs.jl

@@ -8,7 +8,7 @@ version = v"5.5"
 # Collection of sources required to build rr
 sources = [
     GitSource("https://github.com/Keno/rr.git",
-              "c0aa7577800aa43333c4de05d7832f780511a467")
+              "fa6a8da4ecdb20909af13ac8380b7a1d804c71e2")
 ]
 
 # Bash recipe for building across all platforms
@@ -29,6 +29,7 @@ make install
 # rr only supports Linux
 platforms = [
     Platform("x86_64", "linux", libc="glibc"),
+    Platform("aarch64", "linux", libc="glibc")
 ]
 platforms = expand_cxxstring_abis(platforms)
 
@@ -40,11 +41,14 @@ products = [
 # Dependencies that must be installed before this package can be built
 # This is really a build dependency
 dependencies = [
+    # For the capnp generator executable
+    HostBuildDependency("capnproto_jll"),
+    # For the capnp static support library
     BuildDependency("capnproto_jll"),
     Dependency("Zlib_jll"),
     Dependency("CompilerSupportLibraries_jll"),
 ]
 
 # Build the tarballs, and possibly a `build.jl` as well.
 build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies,
-               preferred_gcc_version=v"8")
+               preferred_gcc_version=v"10")