Fix these warnings:

In file included from mpr_complex.cc:18:
../coeffs/longrat.h: In function 'BOOLEAN nlIsInteger(number, coeffs)':
../coeffs/coeffs.h:714:22: warning: statement has no effect [-Wunused-value]
  714 | #define n_Test(a,r)  1
      |                      ^
../coeffs/longrat.h:97:3: note: in expansion of macro 'n_Test'
   97 |   n_Test(q, r);
      |   ^~~~~~
mpr_complex.cc: In function 'bool operator>(const gmp_float&, const gmp_float&)':
mpr_complex.cc:290:11: warning: comparison between two arrays [-Warray-compare]
  290 |   if (a.t == b.t)
      |       ~~~~^~~~~~
mpr_complex.cc:290:11: note: use unary '+' which decays operands to pointers or '&'component_ref' not supported by dump_decl<declaration error>[0] == &'component_ref' not supported by dump_decl<declaration error>[0]' to compare the addresses
mpr_complex.cc: In function 'bool operator<(const gmp_float&, const gmp_float&)':
mpr_complex.cc:296:11: warning: comparison between two arrays [-Warray-compare]
  296 |   if (a.t == b.t)
      |       ~~~~^~~~~~
mpr_complex.cc:296:11: note: use unary '+' which decays operands to pointers or '&'component_ref' not supported by dump_decl<declaration error>[0] == &'component_ref' not supported by dump_decl<declaration error>[0]' to compare the addresses
mpr_complex.cc: In function 'bool operator>=(const gmp_float&, const gmp_float&)':
mpr_complex.cc:302:11: warning: comparison between two arrays [-Warray-compare]
  302 |   if (a.t == b.t)
      |       ~~~~^~~~~~
mpr_complex.cc:302:11: note: use unary '+' which decays operands to pointers or '&'component_ref' not supported by dump_decl<declaration error>[0] == &'component_ref' not supported by dump_decl<declaration error>[0]' to compare the addresses
mpr_complex.cc: In function 'bool operator<=(const gmp_float&, const gmp_float&)':
mpr_complex.cc:308:11: warning: comparison between two arrays [-Warray-compare]
  308 |   if (a.t == b.t)
      |       ~~~~^~~~~~
mpr_complex.cc:308:11: note: use unary '+' which decays operands to pointers or '&'component_ref' not supported by dump_decl<declaration error>[0] == &'component_ref' not supported by dump_decl<declaration error>[0]' to compare the addresses

--- Singular-Release-4-2-1p3/libpolys/coeffs/mpr_complex.cc.orig	2021-12-17 11:35:18.000000000 -0700
+++ Singular-Release-4-2-1p3/libpolys/coeffs/mpr_complex.cc	2022-07-25 10:49:45.733632538 -0600
@@ -287,25 +287,25 @@ bool gmp_float::isMOne() const
 }
 bool operator > ( const gmp_float & a, const gmp_float & b )
 {
-  if (a.t == b.t)
+  if (&a.t == &b.t)
     return false;
   return mpf_cmp( a.t, b.t ) > 0;
 }
 bool operator < ( const gmp_float & a, const gmp_float & b )
 {
-  if (a.t == b.t)
+  if (&a.t == &b.t)
     return false;
   return mpf_cmp( a.t, b.t ) < 0;
 }
 bool operator >= ( const gmp_float & a, const gmp_float & b )
 {
-  if (a.t == b.t)
+  if (&a.t == &b.t)
     return true;
   return mpf_cmp( a.t, b.t ) >= 0;
 }
 bool operator <= ( const gmp_float & a, const gmp_float & b )
 {
-  if (a.t == b.t)
+  if (&a.t == &b.t)
     return true;
   return mpf_cmp( a.t, b.t ) <= 0;
 }