crc32c: don't install gtest

The desired behavior can be controlled with a configuration option
instead of manually cleaning the output afterwards.

pkgs/development/libraries/crc32c/default.nix

@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
     "-DCRC32C_BUILD_TESTS=1"
     "-DCRC32C_BUILD_BENCHMARKS=0"
     "-DCRC32C_USE_GLOG=0"
+    "-DINSTALL_GTEST=0"
     "-DBUILD_SHARED_LIBS=${if staticOnly then "0" else "1"}"
   ];
 
@@ -42,20 +43,7 @@ stdenv.mkDerivation rec {
     runHook postInstallCheck
   '';
 
-  postInstallCheck = ''
-    # without removing these libraries, dependents will look for
-    # libgtest/libgmock etc here, which can result in link time errors
-    rm $out/lib/libg*
-  '';
-
   postFixup = ''
-    # dependents shouldn't be able to find gtest libraries as dependencies of
-    # this package
-    rm -r $out/lib/pkgconfig
-
-    # remove GTest cmake config files
-    rm -r $out/lib/cmake/GTest
-
     # fix bogus include paths
     for f in $(find $out/lib/cmake -name '*.cmake'); do
       substituteInPlace "$f" --replace "\''${_IMPORT_PREFIX}/$out/include" "\''${_IMPORT_PREFIX}/include"