gnu: gmp: Drop patch included in release 6.1.0.

* gnu/packages/multiprecision.scm (gmp)[source]: Drop patch.
* gnu/packages/patches/gmp-arm-asm-nothumb.patch: Remove patch.
* gnu-system.am (dist_patch_DATA): Unregister patch.

gnu-system.am

@@ -476,7 +476,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/glibc-locale-incompatibility.patch	\
   gnu/packages/patches/glibc-o-largefile.patch			\
   gnu/packages/patches/glibc-versioned-locpath.patch		\
-  gnu/packages/patches/gmp-arm-asm-nothumb.patch		\
   gnu/packages/patches/gmp-faulty-test.patch			\
   gnu/packages/patches/gnucash-price-quotes-perl.patch		\
   gnu/packages/patches/gnutls-doc-fix.patch			\

gnu/packages/multiprecision.scm

@@ -40,8 +40,7 @@
              (base32
               "12b9s4jn48gbar6dbs5qrlmljdmnq43xy3ji9yjzic0mwp6dmnk8"))
             (patches (map search-patch
-                          '("gmp-arm-asm-nothumb.patch"
-                            "gmp-faulty-test.patch")))))
+                          '("gmp-faulty-test.patch")))))
    (build-system gnu-build-system)
    (native-inputs `(("m4" ,m4)))
    (outputs '("out" "debug"))

gnu/packages/patches/gmp-arm-asm-nothumb.patch

@@ -1,21 +0,0 @@
-
-# HG changeset patch
-# User Torbjorn Granlund <tege@gmplib.org>
-# Date 1396602422 -7200
-# Node ID 676e2d0f0e4dd301a7066079d2c9326c25c34a40
-# Parent  0194a75b56b21a9196626430af86c5bd9110c42d
-Conditionalise ARM asm on !__thumb__.
-
-diff -r 0194a75b56b2 -r 676e2d0f0e4d mpn/generic/div_qr_1n_pi1.c
---- a/mpn/generic/div_qr_1n_pi1.c	Thu Apr 03 23:58:51 2014 +0200
-+++ b/mpn/generic/div_qr_1n_pi1.c	Fri Apr 04 11:07:02 2014 +0200
-@@ -130,7 +130,7 @@
- 	     "%2" ((UDItype)(a0)), "r" ((UDItype)(b0)) __CLOBBER_CC)
- #endif
- 
--#if defined (__arm__) && W_TYPE_SIZE == 32
-+#if defined (__arm__) && !defined (__thumb__) && W_TYPE_SIZE == 32
- #define add_mssaaaa(m, sh, sl, ah, al, bh, bl)				\
-   __asm__ (  "adds	%2, %5, %6\n\t"					\
- 	     "adcs	%1, %3, %4\n\t"					\
-