scst.spec.in: Replace custom Requires line with package names

The scst.spec.in file used a custom Requires line that dynamically resolved
the full paths of the find and rm commands using shell substitution with
'which'. This method is non-standard and can lead to issues in constrained
build environments.

This patch replaces the custom Requires line with explicit package names:
'findutils' for find and 'coreutils' for rm. This improves compatibility
and aligns with best practices for declaring dependencies in spec files.

scst.spec.in

@@ -90,7 +90,7 @@ BuildRequires:	%{?kernel_rpm:%{kernel_rpm} = %{krpmver} %{kernel_devel_rpm} = %{
 Source:		%{kmod_name}-%{version}.tar.bz2
 BuildRoot:	%{_tmppath}/%{name}-%{version}-build
 AutoReqProv:	no
-Requires:	%{?kernel_rpm:%{kernel_rpm} = %{krpmver}} @depmod@ %{expand:%%(for c in find rm; do echo -n "$(PATH=/usr/sbin:/usr/bin:/sbin:/bin which $c) "; done)}
+Requires:	%{?kernel_rpm:%{kernel_rpm} = %{krpmver}} @depmod@ coreutils findutils
 Provides:	scst
 
 %description