Rebase mpfr patch on upstream commit

build/pkgs/mpfr/patches/clang_workaround.patch

@@ -1,18 +1,20 @@
 diff --git a/src/set_d.c b/src/set_d.c
-index c076ccf..709cbe2 100644
+index c076ccf..5fc9548 100644
 --- a/src/set_d.c
 +++ b/src/set_d.c
-@@ -118,7 +118,13 @@ __gmpfr_extract_double (mpfr_limb_ptr rp, double d)
+@@ -118,8 +118,15 @@ __gmpfr_extract_double (mpfr_limb_ptr rp, double d)
 
      d *= MP_BASE_AS_DOUBLE;
  #if GMP_NUMB_BITS >= 64
-+#ifdef __clang__
-+    /* Work around for clang see: */
-+    /* https://bugs.llvm.org//show_bug.cgi?id=8100 */
-+    manl = 0x8000000000000000 + (mp_limb_t) (d - 9223372036854775808.0);
-+#else /* __clang__ */
++#ifndef __clang__
      manl = d;
-+#endif /* __clang__ */
  #else
++    /* clang produces an invalid exception when d >= 2^63,
++       see https://bugs.llvm.org//show_bug.cgi?id=17686.
++       Since this is always the case, here, we use the following patch. */
++    manl = 0x8000000000000000 + (mp_limb_t) (d - 0x8000000000000000);
++#endif /* __clang__ */
++#else
      manh = (mp_limb_t) d;
      manl = (mp_limb_t) ((d - manh) * MP_BASE_AS_DOUBLE);
+ #endif