[Buildroot] [PATCH v2] package/opencv: fix a webp dependency

[Alessandro Rubini <rubini@gnudd.com>]

When BR2_PACKAGE_OPENCV4_WITH_WEBP=y we need to enable mux and demux
too, otherwise build fails as follows:

    CMake Error: The following variables are used in this project,
         but they are set to NOTFOUND.
    Please set them or make sure they are set and tested correctly
         in the CMake files:
    WEBP_DEMUX_LIBRARY
    linked by target "opencv_imgcodecs"
         in directory [...]/build/opencv4-4.13.0/modules/imgcodecs
    WEBP_MUX_LIBRARY
    linked by target "opencv_imgcodecs"
         in directory [...]/build/opencv4-4.13.0/modules/imgcodecs

The issue already exists in 2025.02.x (thanks Thomas for checking),
but not in 2023.08.x whence my defconfig originated.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
---

This is v2 of what was called "package/opencv: depend on webp mux/demux",
but as suggested by Thomas the dependency is not uplevel, so this is
fixed according to his suggestions. Tested on current master.

 package/opencv4/Config.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/package/opencv4/Config.in b/package/opencv4/Config.in
index 47c1cf3f4a..e4a15f742b 100644
--- a/package/opencv4/Config.in
+++ b/package/opencv4/Config.in
@@ -369,6 +369,8 @@ config BR2_PACKAGE_OPENCV4_WITH_V4L
 config BR2_PACKAGE_OPENCV4_WITH_WEBP
 	bool "webp support"
 	select BR2_PACKAGE_WEBP
+	select BR2_PACKAGE_WEBP_DEMUX
+	select BR2_PACKAGE_WEBP_MUX
 	help
 	  Enable WebP support.
 
-- 
2.47.3
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