tests: opencv-module-dnn stays linux+macOS (opencv-m module pkg not windows-enabled yet); compat opencv-dnn keeps windows (fast_gemm dnn — CI-passing)

Author: Sunrisepeak

tests/examples/opencv-module-dnn/mcpp.toml

@@ -19,7 +19,4 @@ opencv = { version = "0.0.6", features = ["dnn"] }
 [target.'cfg(macos)'.dependencies]
 opencv = { version = "0.0.6", features = ["dnn"] }
 
-# windows: `import opencv.dnn;` on windows-x86_64 (fast_gemm backend, mlas skipped).
-[target.'cfg(windows)'.dependencies]
-opencv = { version = "0.0.6", features = ["dnn"] }
 

tests/examples/opencv-module-dnn/tests/opencv_dnn_iface.cpp

@@ -4,7 +4,7 @@
 // Linux-only (see mcpp.toml). Not named dnn.cpp (would collide with the dep's
 // modules/dnn/src/dnn.cpp — #240 family). Import-only (import std + the opencv
 // modules): no textual headers, matching the ffmpeg-module member convention.
-#if defined(__linux__) || defined(__APPLE__) || defined(_WIN32)
+#if defined(__linux__) || defined(__APPLE__)
 import std;
 import opencv.cv;
 import opencv.dnn;