[librsvg] NMake Makefiles: Support running rsvg_internals tests

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

commit dfcaf1f10d5762ac769cf5bf9ae9175e81f4ff82
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 25 15:14:28 2020 +0800

    NMake Makefiles: Support running rsvg_internals tests
    
    Add an NMake Makefile target that calls `cargo test` in rsvg_internals/ with
    the appropriate flags for our Visual Studio builds, so that we can test the
    Rust bits in our Visual  Studio builds as well

 win32/Makefile.vc | 11 +++++++++++
 win32/README.txt  |  3 +++
 2 files changed, 14 insertions(+)
---
diff --git a/win32/Makefile.vc b/win32/Makefile.vc
index a2bc5c6c..e4d315e8 100644
--- a/win32/Makefile.vc
+++ b/win32/Makefile.vc
@@ -44,6 +44,17 @@ tests: all $(rsvg_tests)
        set G_TEST_SRCDIR=$(MAKEDIR)\..\tests
        @for %%x in ($(rsvg_tests)) do %%x
 
+rsvg_rust_tests:
+       @set PATH=%PATH%;%HOMEPATH%\.cargo\bin
+       @set CARGO_TARGET_DIR=..\win32\vs$(VSVER)\$(CFG)\$(PLAT)\obj\rsvg_c_api
+       @set GTK_LIB_DIR=$(LIBDIR);$(LIB)
+       $(RUSTUP_CMD)
+       @cd ..\rsvg_internals
+       $(CARGO_CMD:build=test) --verbose
+       @cd ..\win32
+       @set GTK_LIB_DIR=
+       @set CARGO_TARGET_DIR=
+
 # Include the rules for build directory creation and code generation
 !include generate-msvc.mak
 
diff --git a/win32/README.txt b/win32/README.txt
index 0cd39863..a7e31a83 100644
--- a/win32/README.txt
+++ b/win32/README.txt
@@ -63,6 +63,9 @@ for all targets.
                   the introspection files (.gir/.typelib) for librsvg.
 -all: see (not specified).
 -tests: Same as (not specified) but also builds the test programs in $(srcroot)\tests
+-rsvg_rust_tests: Makes a build of the rust items into an executable to test the rust
+                  bits.  You may need to make a copy of libxml2.lib (or so) to xml2.lib
+                  in order to build this successfully.
 -clean: Removes all build files
 -install: Same as (not specified) and also copies the built DLLs, .lib's, headers,
           tools and possibly introspection files to appropriate locations under