gnu: gcc@5: Update to 5.5.0.

* gnu/packages/gcc.scm (gcc@5): Update to 5.5.0.
[source]: Switch to '.tar.xz' tarball. Remove patch.
* gnu/packages/patches/gcc-asan-powerpc-missing-include.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -625,7 +625,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/gawk-shell.patch				\
   %D%/packages/patches/gcc-arm-bug-71399.patch			\
   %D%/packages/patches/gcc-arm-link-spec-fix.patch		\
-  %D%/packages/patches/gcc-asan-powerpc-missing-include.patch	\
   %D%/packages/patches/gcc-cross-environment-variables.patch	\
   %D%/packages/patches/gcc-fix-texi2pod.patch			\
   %D%/packages/patches/gcc-libvtv-runpath.patch			\

gnu/packages/gcc.scm

@@ -382,17 +382,16 @@ Go.  It also includes runtime support libraries for these languages.")
   ;; Note: GCC >= 5 ships with .info files but 'make install' fails to install
   ;; them in a VPATH build.
   (package (inherit gcc-4.9)
-    (version "5.4.0")
+    (version "5.5.0")
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://gnu/gcc/gcc-"
-                                  version "/gcc-" version ".tar.bz2"))
+                                  version "/gcc-" version ".tar.xz"))
               (sha256
                (base32
-                "0fihlcy5hnksdxk0sn6bvgnyq8gfrgs8m794b1jxwd1dxinzg3b0"))
+                "11zd1hgzkli3b2v70qsm2hyqppngd4616qc96lmm9zl2kl9yl32k"))
               (patches (search-patches "gcc-arm-bug-71399.patch"
                                        "gcc-strmov-store-file-names.patch"
-                                       "gcc-asan-powerpc-missing-include.patch"
                                        "gcc-5.0-libvtv-runpath.patch"
                                        "gcc-5-source-date-epoch-1.patch"
                                        "gcc-5-source-date-epoch-2.patch"

gnu/packages/patches/gcc-asan-powerpc-missing-include.patch

@@ -1,20 +0,0 @@
-Add missing include that triggers a build failure on PowerPC:
-
-  ../../../../gcc-5.4.0/libsanitizer/asan/asan_linux.cc: In function ‘bool __asan::AsanInterceptsSignal(int)’:
-  ../../../../gcc-5.4.0/libsanitizer/asan/asan_linux.cc:222:20: error: ‘SIGSEGV’ was not declared in this scope
-     return signum == SIGSEGV && common_flags()->handle_segv;
-		      ^
-From <https://patchwork.ozlabs.org/patch/725596/>.
-
-diff --git a/libsanitizer/asan/asan_linux.cc b/libsanitizer/asan/asan_linux.cc
-index c504168..59087b9 100644
---- a/libsanitizer/asan/asan_linux.cc
-+++ b/libsanitizer/asan/asan_linux.cc
-@@ -29,6 +29,7 @@
- #include <dlfcn.h>
- #include <fcntl.h>
- #include <pthread.h>
-+#include <signal.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <unwind.h>