Update compiler versions

conda_build_config.yaml

 c_compiler:
+  - gcc                        # [linux and aarch64]
   - clang                      # [osx]
 cxx_compiler:
+  - gxx                        # [linux and aarch64]
   - clangxx                    # [osx]
 fortran_compiler_version:
 # matrix on linux, because the ABI breaks at GCC 8
-  - 7.3.0                      # [linux]
-  - 8.2.0                      # [linux]
+  - 7.5.0                      # [linux and not (s390x or aarch64 or ppc64le)]
+  - 8.4.0                      # [linux and not (s390x or aarch64 or ppc64le)]
+  - 7.3.0                      # [linux and ppc64le]
+  - 8.2.0                      # [linux and ppc64le]
+  - 7.5.0                      # [linux and s390x]
+  - 8.4.0                      # [linux and s390x]
+  - 10.2.0                     # [linux and aarch64]
+  - 10.2.0                     # [linux and aarch64]
 rust_compiler:
   - rust
 rust_compiler_version:
   - 1.40.0
 
 c_compiler_version:        # [linux or osx]
-  - 7.3.0                  # [linux]
+  - 7.5.0                  # [linux and not (s390x or aarch64 or ppc64le)]
+  - 7.3.0                  # [linux and ppc64le]
+  - 7.5.0                  # [linux and s390x]
+  - 10.2.0                 # [linux and aarch64]
   - 10                     # [osx]
 cxx_compiler_version:      # [linux or osx]
-  - 7.3.0                  # [linux]
+  - 7.5.0                  # [linux and not (s390x or aarch64 or ppc64le)]
+  - 7.3.0                  # [linux and ppc64le]
+  - 7.5.0                  # [linux and s390x]
+  - 10.2.0                 # [linux and aarch64]
   - 10                     # [osx]
 clang_variant:
   - clang