Fix erroneous parsing of tsquery input "... & !(subexpression) | ..."

After parsing a parenthesized subexpression, we must pop all pending
ANDs and NOTs off the stack, just like the case for a simple operand.
Per bug #5793.

Also fix clones of this routine in contrib/intarray and contrib/ltree,
where input of types query_int and ltxtquery had the same problem.

Back-patch to all supported versions.

contrib/intarray/_int_bool.c

@@ -196,7 +196,7 @@ makepol(WORKSTATE *state)
 			case OPEN:
 				if (makepol(state) == ERR)
 					return ERR;
-				if (lenstack && (stack[lenstack - 1] == (int4) '&' ||
+				while (lenstack && (stack[lenstack - 1] == (int4) '&' ||
 									stack[lenstack - 1] == (int4) '!'))
 				{
 					lenstack--;

contrib/ltree/ltxtquery_io.c

@@ -241,7 +241,7 @@ makepol(QPRS_STATE *state)
 			case OPEN:
 				if (makepol(state) == ERR)
 					return ERR;
-				if (lenstack && (stack[lenstack - 1] == (int4) '&' ||
+				while (lenstack && (stack[lenstack - 1] == (int4) '&' ||
 									stack[lenstack - 1] == (int4) '!'))
 				{
 					lenstack--;

src/backend/utils/adt/tsquery.c

@@ -371,7 +371,7 @@ makepol(TSQueryParserState state,
 			case PT_OPEN:
 				makepol(state, pushval, opaque);
 
-				if (lenstack && (opstack[lenstack - 1] == OP_AND ||
+				while (lenstack && (opstack[lenstack - 1] == OP_AND ||
 									opstack[lenstack - 1] == OP_NOT))
 				{
 					lenstack--;