Bump version of libarchive (#1130)

* Fix version of libarchive If I try to set up a clean environment on linux I get essentially this error: conda/conda#8838 when trying to import NNPDF, which as said on the issue gets solved if one installs libiconv manually. Indeed checking libarchive with ldd I see that it is asking for libiconv and not finding it. It seems there is some amount of dancing around of dancing around in the conda forge channel with it being added conda-forge/libarchive-feedstock#36 and then removed conda-forge/libarchive-feedstock#59 and seems that that somehow can result in an incompatible environment. Pin the version to one that works.
NNPDF · Mar 10, 2021 · 65208fc · 65208fc
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diff --git a/conda-recipe/conda_build_config.yaml b/conda-recipe/conda_build_config.yaml
@@ -8,3 +8,4 @@ pin_run_as_build:
     apfel: x.x.x.x
     gsl: x.x.x
     yaml-cpp: x.x
+    libarchive: x.x
diff --git a/conda-recipe/meta.yaml b/conda-recipe/meta.yaml
@@ -16,7 +16,7 @@ requirements:
         - lhapdf      # with python wrapper
         - sqlite
         - gsl         # Gsl doesn't link openblas on old debian 7
-        - libarchive
+        - libarchive ==3.4.2 # See https://github.com/NNPDF/nnpdf/pull/1130
         - yaml-cpp
         - apfel >=3   # see https://github.com/scarrazza/apfel
         - python