DF_1_PIE is not in glibc-headers-2.12 elf.h

--- dyninst-12.1.0/symtabAPI/src/Object-elf.C.orig	2022-03-09 17:41:45.000000000 -0500
+++ dyninst-12.1.0/symtabAPI/src/Object-elf.C	2022-05-10 10:53:13.590048775 -0400
@@ -516,3 +516,3 @@ bool Object::loaded_elf(Offset &txtaddr,
 		    case DT_FLAGS_1:
-			hasPieFlag_ = dynsecData.d_val(j) & DF_1_PIE;
+		      /* hasPieFlag_ = dynsecData.d_val(j) & DF_1_PIE; */
 			break;