To break dependency loop.
Math::Prime::Util requires Math::Prime::Util::GMP

--- Math-Prime-Util-GMP-0.52/Makefile.PL.orig
+++ Math-Prime-Util-GMP-0.52/Makefile.PL
@@ -55,13 +55,6 @@
                     url  => 'https://github.com/danaj/Math-Prime-Util-GMP',
                   },
                },
-               prereqs => {
-                 runtime => {
-                   recommends => {
-                     'Math::Prime::Util' => 0.68,
-                   },
-                 },
-               },
                provides => {
                  'Math::Prime::Util::GMP' => {
                     version => '0.52',
--- Math-Prime-Util-GMP-0.52/META.json.orig
+++ Math-Prime-Util-GMP-0.52/META.json
@@ -31,9 +31,6 @@
          }
       },
       "runtime" : {
-         "recommends" : {
-            "Math::Prime::Util" : "0.68"
-         },
          "requires" : {
             "Carp" : "0",
             "Exporter" : "5.57",