configure.ac, scripts/Windows/dllldd.sh: use question mark in grep regex, that seems to work everywhere and suits the purpose better [#2920]

Signed-off-by: Jim Klimov <jimklimov+nut@gmail.com>

Author: jimklimov

configure.ac

@@ -3703,7 +3703,7 @@ no)
 	if test -n "${DOC_CANNOTBUILD_LIST}"; then
 		DOC_CANNOTBUILD_LIST_LINES="`echo "${DOC_CANNOTBUILD_LIST}" | tr ' ' '\n' | grep -vE '^$'`"
 		for DOCTYPE in ${DOC_BUILD_LIST} ; do
-			if echo "${DOC_CANNOTBUILD_LIST_LINES}" | grep -E "^${DOCTYPE}(=yes)*\$" ; then
+			if echo "${DOC_CANNOTBUILD_LIST_LINES}" | grep -E "^${DOCTYPE}(=yes)?\$" ; then
 				AC_MSG_ERROR([Unable to build${DOC_CANNOTBUILD_LIST} documentation (check for 'no' results above)])
 			else if echo "${DOC_CANNOTBUILD_LIST_LINES}" | grep -E "^${DOCTYPE}=(skip|auto|dist-auto)\$" ; then
 				AC_MSG_NOTICE([Unable to build${DOC_CANNOTBUILD_LIST} documentation (check for 'no' results above), skipping])

scripts/Windows/dllldd.sh

@@ -26,7 +26,7 @@ dllldd() (
 		for OD in objdump "$ARCH-objdump" ; do
 			(command -v "$OD" >/dev/null 2>/dev/null) || continue
 
-			ODOUT="`$OD -x "$@" 2>/dev/null | grep -Ei "DLL Name:" | awk '{print $NF}' | sort | uniq | grep -vEi '^(/.*/)*(msvcrt|userenv|bcrypt|rpcrt4|usp10|(advapi|kernel|user|wsock|ws2_|gdi|ole||shell)(32|64))\.dll$'`" \
+			ODOUT="`$OD -x "$@" 2>/dev/null | grep -Ei "DLL Name:" | awk '{print $NF}' | sort | uniq | grep -vEi '^(/.*/)?(msvcrt|userenv|bcrypt|rpcrt4|usp10|(advapi|kernel|user|wsock|ws2_|gdi|ole||shell)(32|64))\.dll$'`" \
 			&& [ -n "$ODOUT" ] || continue
 
 			for F in $ODOUT ; do