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=8852f911ff506dd50b714274ba0e2143f0285f78'>root</a>/<a href='/guix/log/gnu?id=8852f911ff506dd50b714274ba0e2143f0285f78'>gnu</a>/<a href='/guix/log/gnu/build?id=8852f911ff506dd50b714274ba0e2143f0285f78'>build</a>/<a href='/guix/log/gnu/build/chromium-extension.scm?id=8852f911ff506dd50b714274ba0e2143f0285f78'>chromium-extension.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/build/chromium-extension.scm?id=8852f911ff506dd50b714274ba0e2143f0285f78&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-23 03:07:34 +0100'>2021-12-23</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=a89d65eec1948cbcbf9936939906fae9cdabf1e7'>chromium-extension: Avoid another usage of the store-mapped /tmp.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm (make-crx): Use a Chromium profile relative
to the build directory instead of /tmp.  While here, remove obsolete comment.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-16 22:21:13 +0100'>2021-12-16</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=aec6bd0169bb855a3ec70f5edec0701d0a66ce9d'>chromium-extension: Build .crx files in a deterministic fashion.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm (make-crx): Pass #:keep-mtime? #t to
COPY-RECURSIVELY.  Remove defunct FAKETIME workaround.  While at it, pack the
extension in the scratch working directory instead of the transient
store-mapped /tmp.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-16 22:21:13 +0100'>2021-12-16</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=40ebf85b865cb942c2551bfdc2ca3065eb3d9186'>chromium-extension: Avoid usage of gcrypt at evaluation time.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm (make-signing-key): Wrap builder in
with-extensions, and compute the seed checksum at build time.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-16 22:21:13 +0100'>2021-12-16</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=173860eb41102c5af2cfdc0404808075d5a5ff3a'>chromium-extension: Reduce imported-modules scope.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm (make-crx): Delay with-imported-modules
until the builder code.
(crx-&gt;chromium-json): Remove needless define* while at it.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-12-16 22:21:13 +0100'>2021-12-16</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=f59bb27557ee8d115efb120292112387a6d23490'>chromium-extension: Simplify builder code.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm (chromium-json-&gt;profile-object): Remove
variable.
(file-sha256): New variable.
(make-chromium-extension): Rename OUTPUT parameter to prevent conflict.
Adjust other variable names for clarity.
[inputs]: Clear.
[arguments]: Inline and simplify the final transformation with a gexp.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-11-08 18:21:15 +0100'>2020-11-08</span></td><td><a href='/guix/commit/gnu/build/chromium-extension.scm?id=d7a295b24b8b84ca3193d30249a01f292178105a'>Add (gnu build chromium-extension).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/chromium-extension.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adjust accordingly.
</span></span></td><td>Marius Bakke</td></tr>