use dynamic linking instead of dlopen on all Linux distros

- also document the need for "librocksdb-dev" on Debian

README.md

@@ -12,6 +12,10 @@ A Nim wrapper for [Facebook's RocksDB](https://github.com/facebook/rocksdb), a p
 
 Nim-RocksDB currently provides a wrapper for the low-level functions of RocksDB
 
+## Requirements
+
+A RocksDB installation that provides `librocksdb.so`. This means that on Debian, and possibly on other Linux distros, you need "librocksdb-dev", not just a versioned "librocksdbX.Y" package that only provides `librocksdb.so.X.Y.Z`.
+
 ## Usage
 
 See [simple_example](examples/simple_example.nim)

rocksdb/librocksdb.nim

@@ -47,9 +47,7 @@ else:
 
 proc shouldUseNativeLinking(): bool {.compileTime.} =
   when defined(linux):
-    let uname = staticExec("uname -a")
-    if uname.find("ARCH") != -1: # Arch linux
-      return true
+    return true
 
 template rocksType(T) =
   type T* = distinct pointer