make sure GNU make ignores the brain-dead GNUmakefile in the Bison tree

bison/bison.spec

@@ -64,11 +64,11 @@ AutoReqProv:  no
     CFLAGS="%{l_cflags -O}" \
     ./configure \
         --prefix=%{l_prefix}
-    %{l_make} %{l_mflags}
+    %{l_make} -f Makefile %{l_mflags}
 
 %install
     rm -rf $RPM_BUILD_ROOT
-    %{l_make} %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
+    %{l_make} -f Makefile %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
     strip $RPM_BUILD_ROOT%{l_prefix}/bin/* >/dev/null 2>&1 || true
     rm -f $RPM_BUILD_ROOT%{l_prefix}/info/dir
     rm -f $RPM_BUILD_ROOT%{l_prefix}/lib/charset.alias