Remove cat_ignore_eagain (facebook#9531)

Summary:
... since it was only necessary to work around a bug on certain Ubuntu
16.04 images (and we now use 20.04 across the board).

Pull Request resolved: facebook#9531

Test Plan: Watch CI.

Reviewed By: ajkr

Differential Revision: D34089424

Pulled By: ltamasi

fbshipit-source-id: f15f86332c119099f61b9bdc74604657fc5d964e

.circleci/config.yml

@@ -361,7 +361,7 @@ jobs:
     steps:
       - pre-steps
       - run: sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test && sudo apt-get update -y && sudo apt-get install gcc-7 g++-7 libgflags-dev
-      - run: CC=gcc-7 CXX=g++-7 V=1 make -j32 check 2>&1 | .circleci/cat_ignore_eagain
+      - run: CC=gcc-7 CXX=g++-7 V=1 make -j32 check
       - post-steps
 
   build-linux-gcc-8-no_test_run:
@@ -371,7 +371,7 @@ jobs:
     steps:
       - pre-steps
       - run: sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test && sudo apt-get update -y && sudo apt-get install gcc-8 g++-8 libgflags-dev
-      - run: CC=gcc-8 CXX=g++-8 V=1 make -j8 all 2>&1 | .circleci/cat_ignore_eagain
+      - run: CC=gcc-8 CXX=g++-8 V=1 make -j8 all
       - post-steps
 
   build-linux-gcc-10-cxx20-no_test_run: