[librsvg/master.msvc: 2/5] Cargo.toml: Make some more packages optional on Windows

[Chun-wei Fan <fanchunwei src gnome org>]

commit 53053b00645b34ceb17a981e6fb62db12153a3d1
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Jul 8 16:41:47 2021 +0800

    Cargo.toml: Make some more packages optional on Windows
    
    The underlying issue is that these packages' build systems may not have
    pkg-config files generated for us for their Visual Studio build system,
    so we feed things into the linker instead.

 Cargo.toml | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/Cargo.toml b/Cargo.toml
index e74794ef..9afb5480 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,27 +6,33 @@ build = "build.rs"
 edition = "2018"
 
 [package.metadata.system-deps]
-cairo = "1.16"
-cairo-gobject = "1.16"
 cairo-pdf = { version = "1.16", optional = true }
-cairo-png = "1.16"
 cairo-ps = { version = "1.16", optional = true }
 cairo-svg = { version = "1.16", optional = true }
-freetype2 = "20.0.14"
 gdk-pixbuf = { name = "gdk-pixbuf-2.0", version = "2.20" }
 gio = { name = "gio-2.0", version = "2.24" }
 glib = { name = "glib-2.0", version = "2.50" }
-harfbuzz = "2.0"
-libxml2 = { name = "libxml-2.0", version = "2.9" }
 pangocairo = "1.44"
 
 [package.metadata.system-deps.'cfg(windows)']
 fontconfig = { version = "1.7", optional = true }
 pangoft2 = { version = "1.44", optional = true }
+harfbuzz = { version = "2.0", optional = true }
+freetype2 = { version = "20.0.14", optional = true }
+cairo = { version = "1.16", optional = true }
+cairo-gobject = { version = "1.16", optional = true }
+cairo-png = { version = "1.16", optional = true }
+libxml2 = { name = "libxml-2.0", version = "2.9", optional = true  }
 
 [package.metadata.system-deps.'cfg(not(windows))']
 fontconfig = { version = "1.7" }
 pangoft2 = { version = "1.44" }
+cairo = "1.16"
+cairo-gobject = "1.16"
+cairo-png = "1.16"
+harfbuzz = "2.0"
+freetype2 = "20.0.14"
+libxml2 = { name = "libxml-2.0", version = "2.9" }
 
 [lib]
 name = "librsvg"