`noopt` should imply `optimize=-lto`

[Michał Sawicz]

There's no sense in enabling LTO if `noopt` is part of the build flags:

```
$ DEB_BUILD_OPTIONS=noopt dpkg-buildflags
ASFLAGS=
ASFLAGS_FOR_BUILD=
CFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection
CFLAGS_FOR_BUILD=-g -O0
CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=0
CPPFLAGS_FOR_BUILD=
CXXFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection
CXXFLAGS_FOR_BUILD=-g -O0
DFLAGS=-fdebug
DFLAGS_FOR_BUILD=-fdebug
FCFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -fcf-protection
FCFLAGS_FOR_BUILD=-g -O0
FFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -fcf-protection
FFLAGS_FOR_BUILD=-g -O0
LDFLAGS=-Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -Wl,-z,relro
LDFLAGS_FOR_BUILD=
OBJCFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection
OBJCFLAGS_FOR_BUILD=-g -O0
OBJCXXFLAGS=-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/tmp=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection
OBJCXXFLAGS_FOR_BUILD=-g -O0
```

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: dpkg-dev 1.22.6ubuntu6
ProcVersionSignature: Ubuntu 6.8.0-38.38-generic 6.8.8
Uname: Linux 6.8.0-38-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 1 11:36:51 2024
InstallationDate: Installed on 2024-02-07 (176 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
PackageArchitecture: all
ProcEnviron:
 LANG=pl_PL.UTF-8
 PATH=(custom, no user)
 SHELL=/usr/bin/zsh
 TERM=screen-256color
 XDG_RUNTIME_DIR=<set>
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: dpkg
UpgradeStatus: Upgraded to noble on 2024-02-07 (176 days ago)