remove %if around patch

libksysguard.spec

@@ -15,10 +15,9 @@ URL:     https://invent.kde.org/plasma/%{name}
 %endif
 Source0: http://download.kde.org/%{stable}/plasma/%{version}/%{name}-%{version}.tar.xz
 
-%if 0%{?rhel} && 0%{?rhel} <= 8
 # GCC 8 and older need stdc++fs link library set
+# GCC 9+ have it set by default.  It does not harm to set it again.
 Patch1:            libksysguard-5.22.2.1_fix-processcore-on-gcc8.patch
-%endif
 
 BuildRequires:  extra-cmake-modules
 BuildRequires:  kf5-rpm-macros