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

@@ -189,7 +189,7 @@ 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

@@ -234,7 +234,7 @@ 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--;

contrib/tsearch2/query.c

@@ -396,7 +396,7 @@ makepol(QPRS_STATE * state, void (*pushval) (QPRS_STATE *, int, char *, int, int
 			case OPEN:
 				if (makepol(state, pushval) == ERR)
 					return ERR;
-				if (lenstack && (stack[lenstack - 1] == (int4) '&' ||
+				while (lenstack && (stack[lenstack - 1] == (int4) '&' ||
 									stack[lenstack - 1] == (int4) '!'))
 				{
 					lenstack--;