add BuildRequires: gcc

Reference: https://fedoraproject.org/wiki/Changes/Remove_GCC_from_BuildRoot

pyscard.spec

@@ -13,6 +13,7 @@ License:        LGPLv2+
 URL:            https://sourceforge.net/projects/pyscard/
 Source0:        http://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.gz
 
+BuildRequires:  gcc
 BuildRequires:  python2-devel
 BuildRequires:  python3-devel
 BuildRequires:  pcsc-lite-devel