internal/rosa/package: migrate many libraries

This also adds more string helpers.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/package/libseccomp/fix-export-oob-read.patch

@@ -0,0 +1,13 @@
+diff --git a/src/api.c b/src/api.c
+index adccef3..65a277a 100644
+--- a/src/api.c
++++ b/src/api.c
+@@ -786,7 +786,7 @@ API int seccomp_export_bpf_mem(const scmp_filter_ctx ctx, void *buf,
+                if (BPF_PGM_SIZE(program) > *len)
+                        rc = _rc_filter(-ERANGE);
+                else
+-                       memcpy(buf, program->blks, *len);
++                       memcpy(buf, program->blks, BPF_PGM_SIZE(program));
+        }
+        *len = BPF_PGM_SIZE(program);
+