Commits on Jan 3, 2020

1. gcc: keep using gcc8 to work-around failing rpi build …

   https://hydra.nixos.org/build/109284638
   
   ```
   In file included from <command-line>:
   ./../include/libc-symbols.h:471:26: error: '__EI___errno_location'
   specifies less restrictive attributes than its target
   '__errno_location': 'const', 'nothrow' [-Werror=missing-attributes]
     471 |   extern __typeof (name) __EI_##name \
         |                          ^~~~~
   ./../include/libc-symbols.h:475:29: note: in expansion of macro
   '__hidden_ver1'
   475 | #  define hidden_def(name)  __hidden_ver1(__GI_##name, name,
   name);
         |                             ^~~~~~~~~~~~~
   ./../include/libc-symbols.h:539:32: note: in expansion of macro
   'hidden_def'
     539 | # define libc_hidden_def(name) hidden_def (name)
         |                                ^~~~~~~~~~
   errno-loc.c:28:1: note: in expansion of macro 'libc_hidden_def'
      28 | libc_hidden_def (__errno_location)
         | ^~~~~~~~~~~~~~~
   errno-loc.c:24:1: note: '__EI___errno_location' target declared here
      24 | __errno_location (void)
         | ^~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
   make[2]: *** [../o-iterator.mk:9: /build/build/csu/errno-loc.os] Error 1
   ```

   

   FRidh committed Jan 3, 2020
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