Remove noarch from doc package

This is to avoid:

BUILDSTDERR: error: Arch dependent binaries in noarch package
BUILDSTDERR:     Arch dependent binaries in noarch package

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

superlu_dist.spec

@@ -19,7 +19,7 @@
 
 Name:          superlu_dist
 Version:       6.1.0
-Release:       2%{?dist}
+Release:       2.0.riscv64%{?dist}
 Summary:       Solution of large, sparse, nonsymmetric systems of linear equations
 License:       BSD
 URL:           http://crd-legacy.lbl.gov/~xiaoye/SuperLU/
@@ -116,7 +116,6 @@ Development files for %name-openmpi
 
 %package doc
 Summary: Documentation for %name
-BuildArch: noarch
 
 %description doc
 Documentation for %name
@@ -253,6 +252,9 @@ make clean
 
 
 %changelog
+* Tue Jul 30 2019 David Abdurachmanov <david.abdurachmanov@sifive.com> - 6.1.0-2.0.riscv64
+- Remove noarch from doc package (temporary change)
+
 * Thu Feb 14 2019 Orion Poplawski <orion@nwra.com> - 6.1.0-2
 - Rebuild for openmpi 3.1.3