configure: Add missing configure options to help text

We forgot to mention --with-git, --libexecdir and --with-pkgversion
so far.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1522163370-18544-1-git-send-email-thuth@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -1497,16 +1497,19 @@ Advanced options (experts only):
   --install=INSTALL        use specified install [$install]
   --python=PYTHON          use specified python [$python]
   --smbd=SMBD              use specified smbd [$smbd]
+  --with-git=GIT           use specified git [$git]
   --static                 enable static build [$static]
   --mandir=PATH            install man pages in PATH
   --datadir=PATH           install firmware in PATH$confsuffix
   --docdir=PATH            install documentation in PATH$confsuffix
   --bindir=PATH            install binaries in PATH
   --libdir=PATH            install libraries in PATH
+  --libexecdir=PATH        install helper binaries in PATH
   --sysconfdir=PATH        install config in PATH$confsuffix
   --localstatedir=PATH     install local state in PATH (set at runtime on win32)
   --firmwarepath=PATH      search PATH for firmware files
   --with-confsuffix=SUFFIX suffix for QEMU data inside datadir/libdir/sysconfdir [$confsuffix]
+  --with-pkgversion=VERS   use specified string as sub-version of the package
   --enable-debug           enable common debug build options
   --enable-sanitizers      enable default sanitizers
   --disable-strip          disable stripping binaries