externals: Remove unused repos.

feae1c4c · bunnei · a24dbcac · b5758fbc · 9d9ba122 · 7e24743a
Commit feae1c4c authored 7 years ago by bunnei
--- a/cpr @ b5758fbc
+++ b/cpr @ b5758fbc
-Subproject commit b5758fbc88021437f968fe5174f121b8b92f5d5c
--- a/enet @ 9d9ba122
+++ b/enet @ 9d9ba122
-Subproject commit 9d9ba122d4818f7ae1aef2197933ac696edb2331
--- a/nihstro @ 7e24743a
+++ b/nihstro @ 7e24743a
-Subproject commit 7e24743af21a7c2e3cef21ef174ae4269d0cfdac
--- a/soundtouch @ 019d2089
+++ b/soundtouch @ 019d2089
-Subproject commit 019d2089bbadf70d73ba85aa8ea51490b071262c