CMake: Fix build due to missing GSL

eigendude · eigendude · commit 69bf0c52f304 · 2020-03-07T18:07:02.000-08:00
Error was:

hexutil.hpp:12:10: fatal error: gsl/span: No such file or directory
 #include &lt;gsl/span&gt;
          ^~~~~~~~~~
diff --git a/cmake/dependencies.cmake b/cmake/dependencies.cmake
@@ -16,6 +16,7 @@ find_package(Boost REQUIRED random filesystem program_options)
 
 # added from hunter_config
 hunter_add_package(GSL)
+find_package(GSL REQUIRED)
 
 # https://www.openssl.org/
 hunter_add_package(OpenSSL)
