enable gnu linux target

Author: dylemma

.travis.yml

@@ -17,7 +17,7 @@ matrix:
     # purportedly safer and has a smaller memory footprint. This program
     # is I/O-bound, so speed isn't really a factor, so we'll use MUSL.
     - env: TARGET=x86_64-unknown-linux-musl TARGET_NICE=linux_x86_64
-    # - env: TARGET=x86_64-unknown-linux-gnu TARGET_NICE=gnu-linux
+    - env: TARGET=x86_64-unknown-linux-gnu TARGET_NICE=linux_x86_64_dynamic
 
     # OSX
     - env: TARGET=x86_64-apple-darwin TARGET_NICE=mac_x86_64