Merge branch 'alps_gcc_8.5.0' into 'master'

Add gcc 8.5.0 for ALPS

See merge request Pmodules/buildblocks!468

Programming/gcc/files/config.yaml

@@ -168,6 +168,16 @@ gcc:
         - overlay: base
           systems: [rhel.*]
 
+    8.5.0:
+      config:
+        relstage: unstable
+        build_requires: [gmp/6.3.0, mpfr/4.2.1, mpc/1.3.1-1]
+        configure_args+:
+          - --enable-languages=c,c++,objc,obj-c++,lto,fortran,go
+      variants:
+        - overlay: PSI
+          systems: [login.*.merlin7.psi.ch, cn.*.merlin7.psi.ch, gpu.*.merlin7.psi.ch]
+
     8.4.0:
       config:
         restage: stable