Do not BR re2c on RHEL

ninja-build.spec

@@ -4,7 +4,7 @@
 
 Name:           ninja-build
 Version:        1.10.2
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Small build system with a focus on speed
 License:        ASL 2.0
 URL:            https://ninja-build.org/
@@ -21,7 +21,9 @@ BuildRequires:  python3-devel
 BuildRequires:  asciidoc
 BuildRequires:  gtest-devel
 %endif
+%if !0%{?rhel}
 BuildRequires:  re2c >= 0.11.3
+%endif
 %if %{without bootstrap}
 Requires:       emacs-filesystem
 Requires:       vim-filesystem
@@ -107,6 +109,10 @@ ln -s ninja %{buildroot}%{_bindir}/ninja-build
 %{rpmmacrodir}/macros.ninja
 
 %changelog
+* Tue May 04 2021 Richard Hughes <rhughes@redhat.com> - 1.10.2-4
+- Do not BR re2c on RHEL. It is NTH, and one less package dep to maintain.
+- Resolves: rhbz#1956954
+
 * Fri Apr 16 2021 Mohan Boddu <mboddu@redhat.com> - 1.10.2-3
 - Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937