Remove %{_isa}

breeze-icon-theme is a noarch package.
Adding %{_isa} gives you an arch specific requirement, such as breeze-icon-theme(x86-64)

breeze-icon-theme.spec

@@ -64,7 +64,7 @@ Requires: %{name} = %{version}-%{release}
 
 %package     devel
 Summary:     Breeze icon theme development files
-Requires:    %{name}%{?_isa} = %{version}-%{release}
+Requires:    %{name} = %{version}-%{release}
 %description devel
 The %{name}-devel package contains libraries and header files for
 developing applications that use %{name}.