Putting back in the BuildRequires for PyQwt-devel but just conditionally removing it on RHEL for now

qgis.spec

@@ -68,6 +68,10 @@ BuildRequires:  libspatialite-devel
 BuildRequires:  postgresql-devel
 BuildRequires:  proj-devel
 BuildRequires:  PyQt4-devel
+# PyQwt doesn't support qwt6, so just turn it off for now on RHEL
+%if 0%{?fedora}
+BuildRequires:  PyQwt-devel
+%endif
 BuildRequires:  python2-devel
 BuildRequires:  qextserialport-devel
 BuildRequires:  qscintilla-devel