*/*: Add := to virtual/zlib deps

Add := to virtual/zlib deps, part 1

Done via:

```
git grep -l virtual/zlib$ | xargs sed -i -e 's@virtual/zlib$@&:=@'
```

Add := to virtual/zlib deps

Done via:

```
git grep -l 'virtual/zlib ' |
  xargs sed -i -e 's@virtual/zlib @virtual/zlib:= @g'
```

Unify virtual/zlib:0= to virtual/zlib:=

Done via:

```
git grep -l 'virtual/zlib:0=' |
  xargs sed -i -e 's@virtual/zlib:0=@virtual/zlib:=@g'
```

Add := to virtual/zlib deps, part 3

Done via:

```
git grep -l 'virtual/zlib:0' |
  xargs sed -i -e 's@virtual/zlib:0@virtual/zlib:=@g'
git grep -l 'virtual/zlib:=/' |
  xargs sed -i -e 's@virtual/zlib:=/@virtual/zlib:0/@g'
```

Add := to virtual/zlib deps, part 4

Done via:

```
git grep -l 'virtual/zlib\[' |
  xargs sed -i -e 's@virtual/zlib\[@virtual/zlib:=\[@g'
```

Use := on virtual/zlib deps, part 5

Done via:

```
git grep -l 'virtual/zlib-' |
  xargs sed -i -r -e 's@virtual/zlib-[0-9.]*(-r[0-9]*)?@&:=@g'
git grep -l 'virtual/zlib-' | xargs sed -i -e 's@:=:=@:=@g'
pkgcheck scan --commits \
  -c SourcingCheck,VisibilityCheck,DependencyCheck --exit error
```

Use := on virtual/zlib deps, part 6

Done via:

```
git grep -l 'virtual/zlib"' | xargs sed -i -e 's@virtual/zlib"@virtual/zlib:="@'
```

Signed-off-by: Paul Zander <negril.nx+gentoo@gmail.com>

app-admin/hardinfo2/hardinfo2-2.2.13.ebuild

@@ -20,7 +20,7 @@ REQUIRED_USE="wayland? ( vulkan ) X? ( vulkan )"
 DEPEND="
 	x11-libs/gtk+:3[wayland?]
 	>=dev-libs/glib-2.24
-	virtual/zlib
+	virtual/zlib:=
 	dev-libs/json-glib
 	net-libs/libsoup:3.0
 	x11-libs/cairo

app-admin/ripasso/ripasso-0.7.0.ebuild

@@ -40,7 +40,7 @@ DEPEND="
 	dev-libs/libgpg-error
 	dev-libs/nettle
 	dev-libs/openssl:0=
-	virtual/zlib
+	virtual/zlib:=
 	gtk? ( gui-libs/gtk )
 "
 RDEPEND="${DEPEND}"