daemon: Remove workaround for -Wanalyzer-mismatching-deallocation

On older GCC:

debug.c:116:32: error: unknown option after ‘#pragma GCC diagnostic’ kind [-Werror=pragmas]
  116 | #pragma GCC diagnostic ignored "-Wanalyzer-mismatching-deallocation"
      |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [Makefile:2039: guestfsd-debug.o] Error 1

The upstream bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99193)
has now been fixed so the workaround is not necessary with the latest
GCC, so just delete the workaround.

daemon/command.c

@@ -103,9 +103,6 @@ commandf (char **stdoutput, char **stderror, unsigned flags,
   return r;
 }
 
-// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99193
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wanalyzer-mismatching-deallocation"
 /**
  * Same as C<command>, but we allow the status code from the
  * subcommand to be non-zero, and return that status code.
@@ -154,7 +151,6 @@ commandrf (char **stdoutput, char **stderror, unsigned flags,
 
   return r;
 }
-#pragma GCC diagnostic pop
 
 /**
  * Same as C<command>, but passing in an argv array.

daemon/debug.c

@@ -111,9 +111,6 @@ do_debug (const char *subcmd, char *const *argv)
   return NULL;
 }
 
-// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99193
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wanalyzer-mismatching-deallocation"
 static char *
 debug_help (const char *subcmd, size_t argc, char *const *const argv)
 {
@@ -143,7 +140,6 @@ debug_help (const char *subcmd, size_t argc, char *const *const argv)
 
   return r;
 }
-#pragma GCC diagnostic pop
 
 /* Show open FDs. */
 static char *