arb: Update to 2.18.1.

* gnu/packages/patches/arb-flint-2.6.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/algebra.scm (arb): Update to 2.18.1.
[source](patches): Remove.

gnu/local.mk

@@ -1,6 +1,6 @@
 # GNU Guix --- Functional package management for GNU
 # Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
-# Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Andreas Enge <andreas@enge.fr>
+# Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Andreas Enge <andreas@enge.fr>
 # Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
 # Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Mark H Weaver <mhw@netris.org>
 # Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
@@ -775,7 +775,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/antlr3-3_1-fix-java8-compilation.patch	\
   %D%/packages/patches/antlr3-3_3-fix-java8-compilation.patch	\
   %D%/packages/patches/apr-skip-getservbyname-test.patch	\
-  %D%/packages/patches/arb-flint-2.6.patch			\
   %D%/packages/patches/aspell-default-dict-dir.patch		\
   %D%/packages/patches/ath9k-htc-firmware-binutils.patch	\
   %D%/packages/patches/ath9k-htc-firmware-gcc.patch		\

gnu/packages/algebra.scm

@@ -495,7 +495,7 @@ fast arithmetic.")
 (define-public arb
   (package
     (name "arb")
-    (version "2.17.0")
+    (version "2.18.1")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -504,8 +504,7 @@ fast arithmetic.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "05lpy3hkl5f8ik19aw40cqydrb932xaf2n8hbq9ib5dnk7f010p1"))
-              (patches (search-patches "arb-flint-2.6.patch"))))
+                "15fx3dcbzgwddw9p1nysmx0dbh058afv5m8cj5pdjkcmcl7kw7z9"))))
     (build-system gnu-build-system)
     (propagated-inputs
      `(("flint" ,flint)))               ; flint.h is included by arf.h

gnu/packages/patches/arb-flint-2.6.patch

@@ -1,48 +0,0 @@
-From d3d9983231e0f034e86a1e75761627eb8213b704 Mon Sep 17 00:00:00 2001
-From: fredrik <fredrik.johansson@gmail.com>
-Date: Wed, 29 Apr 2020 13:41:36 +0200
-Subject: [PATCH] handle flint incompatibilities
-
----
- fmpr.h        | 4 ++++
- fmpz_extras.h | 4 ++++
- 2 files changed, 8 insertions(+)
-
-diff --git a/fmpr.h b/fmpr.h
-index 2204d72e..c6a8c342 100644
---- a/fmpr.h
-+++ b/fmpr.h
-@@ -22,7 +22,11 @@
- #include "flint/flint.h"
- #include "flint/fmpz.h"
- #include "flint/fmpq.h"
-+#if __FLINT_RELEASE < 20600
- #include "flint/config.h"
-+#else
-+#include "flint/flint-config.h"
-+#endif
- #include "fmpz_extras.h"
- 
- #ifndef flint_abort
-diff --git a/fmpz_extras.h b/fmpz_extras.h
-index 4fd0538f..486e28c8 100644
---- a/fmpz_extras.h
-+++ b/fmpz_extras.h
-@@ -43,6 +43,8 @@ fmpz_add_inline(fmpz_t z, const fmpz_t x, const fmpz_t y)
-         fmpz_add(z, x, y);
- }
- 
-+#if __FLINT_RELEASE < 20600
-+
- static __inline__ void
- fmpz_add_si(fmpz_t z, const fmpz_t x, slong y)
- {
-@@ -61,6 +63,8 @@ fmpz_sub_si(fmpz_t z, const fmpz_t x, slong y)
-         fmpz_add_ui(z, x, -y);
- }
- 
-+#endif
-+
- static __inline__ void
- fmpz_add_si_inline(fmpz_t z, const fmpz_t x, slong y)
- {