Fix a string comparison in C++ 11.

Taken from Debian:
https://sources.debian.org/src/dbus-c++/0.9.0-8.1/debian/patches/06_fix_gcc-7_ftbfs.patch/

--- a/src/pipe.cpp
+++ b/src/pipe.cpp
@@ -83,5 +83,5 @@ ssize_t Pipe::read(void *buffer, unsigne
 void Pipe::signal()
 {
   // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...
-  ::write(_fd_write, '\0', 1);
+  ::write(_fd_write, "\0", 1);
 }
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<div class='path'>path: <a href='/guix/log/?id=df35583970a7f6e5e43d04e4e23588555604c4fa&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=df35583970a7f6e5e43d04e4e23588555604c4fa&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=df35583970a7f6e5e43d04e4e23588555604c4fa&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/sugar.scm?id=df35583970a7f6e5e43d04e4e23588555604c4fa&amp;showmsg=1'>sugar.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/sugar.scm?id=df35583970a7f6e5e43d04e4e23588555604c4fa'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2024-10-02 22:54:11 +0200'>2024-10-02</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=a0dc945a1fde6712ec1840d7957b297324d7b7f8'>gnu: sugar-read-activity: Update to 124.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-read-activity): Update to 124.

Change-Id: I46fd70c70ca471ff9514296bc0187d4fb5423830


</td></tr>
<tr class='logheader'><td><span title='2024-09-08 14:23:21 +0200'>2024-09-08</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=892579c44aed2c54884b4f0057cf0b60c25b0fda'>gnu: sugar: Move from DSA to RSA.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
ssh-keygen no longer supports DSA, so we switch to RSA.

* gnu/packages/sugar.scm (sugar)[arguments]: Patch invocation of ssh-keygen to
generate RSA key pair instead of DSA.
(sugar-toolkit-gtk3)[arguments]: Adjust parsing code.

Change-Id: I4b339fc0bc6324bd2d74d40be6fd820e4611f387


</td></tr>
<tr class='logheader'><td><span title='2024-08-18 02:00:00 +0200'>2024-08-18</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=eb03211b1c405f19ccb313e0573836c8fd332d5e'>gnu: sugar-turtlepond-activity: Fix metadata.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
It was copied from sugar-commander-activity and never updated.

* gnu/packages/sugar.scm (sugar-turtlepond-activity)
[home-page, synopsis, description]: Describe sugar-turtlepond-activity.

Change-Id: I551dcabd200e4e5059cf3a47d5e7231fc79e1490


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:18:00 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=e1f17fc3404e626cdeeb2890ab5b7844a3bd1f88'>gnu: Add sugar-commander-activity.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-commander-activity): New variable.

Change-Id: I147999d64ef52e8b070ba96b0928ae19ae620d20


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:18:00 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=fb96a7f5d05aeba8f24ab832326302591b995f3c'>gnu: Add sugar-turtlepond-activity.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-turtlepond-activity): New variable.

Change-Id: I2f2e5323acf9734fd35cae1d2174aea4719b3b7f


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:18:00 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=e0633e56dc0cec3c13729255c7b804f27c722782'>gnu: Add sugar-river-crossing-activity.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-river-crossing-activity): New variable.

Change-Id: I05106843e9118b36e067856c3a00c9d54d7e1834


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:18:00 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=974be4b5ccd6d6afe01cc438165248a596f30512'>gnu: Add sugar-classify-cats-activity.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-classify-cats-activity): New variable.

Change-Id: I1a5a09ec9c17d381d580d1081ac2b65336ad1141


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:18:00 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=c22ee2b5ea03416b3ac04fc28c7390e82d84c69f'>gnu: Add sugar-cellgame-activity.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-cellgame-activity): New variable.

Change-Id: If81eff3b726b90c7454edcd08b2b8421067ce648


</td></tr>
<tr class='logheader'><td><span title='2024-08-20 22:17:59 +0200'>2024-08-20</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/sugar.scm?id=ae748e9ba6035bf6b91f5803cfc5122ffca1d2e7'>gnu: sugar-toolkit-gtk3: Add missing inputs and patch references.</a></td><td>Ricardo Wurmus</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/sugar.scm (sugar-toolkit-gtk3)[arguments]: Add phase
'patch-references.
[inputs]: Add shared-mime-info and unzip.

Change-Id: Id34b0e8696b655b4788cd5d40b1ca78a5eb34597


</td></tr>