shmem instead of findsharedmemory, and allow force posix shmem build option

src/epics/util/lib/createUserModuleBuildEnv.pm

@@ -28,7 +28,7 @@ my ($makefileDir) = @_;
         print OUTM "set(XMIT_DOLPHIN_TIME YES)\n";
     }
 
-    print OUTM "list(APPEND CFLAGS \"-O2\")\n";
+    print OUTM "list(APPEND CFLAGS \"-O2 -fPIC\")\n";
     print OUTM "list(APPEND CFLAGS \"$::servoflag\")\n";
 
     if ($::iopModel > -1) {  #************ SETUP FOR IOP ***************