support also older bison versions

OBS-URL: https://build.opensuse.org/package/show/Base:System/bash?expand=0&rev=376

bash.spec

@@ -90,7 +90,7 @@ Patch49:        bash-4.3-pathtemp.patch
 Patch50:        quotes-man2html.patch
 BuildRequires:  autoconf
 # latest bash uses with patch 18 the tag YYEOF
-BuildRequires:  bison >= 3.8.1
+BuildRequires:  bison
 BuildRequires:  fdupes
 BuildRequires:  glibc-locale
 BuildRequires:  glibc-locale-base
@@ -281,7 +281,7 @@ set -x
 %endif
 %patch -P49  -b .pthtmp
 %patch -P50  -b .qd
-%patch -P0
+%patch -P0   -b .p0
 
 # This has to be always the same version as included in the bash its self
 rl1=($(sed -rn '/RL_READLINE_VERSION/p' lib/readline/readline.h))
@@ -506,6 +506,7 @@ echo exit 0 > tests/read7.sub
   grep -F '$'\' doc/bash.html %{nil:test for boo#1203091}
 
 %check
+  rm -vf tests/*.p0
   %make_build -j1 check
 
 %install