package/libcamera: improve reproducibility for optional dependencies

libcamera has some optional dependencies that automatically detected at
build time.

To improve reproducibility, we should add a dependency on those optional
dependencies if the symbols that build them are enabled so that the
order in which packages are built does not influence the libcamera
package.

Note that the optional libyuv dependency isn't added as:
1) it is only used for the virtual pipeline and the android feature,
   both of which are disabled/not supported right now,
2) libcamera has it in a submodule if missing (though if that works with
   Buildroot is to be determined),
3) adding the dependency isn't enough as meson somehow doesn't find the
   dependency,

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libcamera/libcamera.mk

@@ -82,6 +82,27 @@ LIBCAMERA_CONF_OPTS += -Dcam=enabled
 LIBCAMERA_DEPENDENCIES += libevent
 endif
 
+ifeq ($(BR2_PACKAGE_ELFUTILS),y)
+# Optional dependency on libdw
+LIBCAMERA_DEPENDENCIES += elfutils
+endif
+
+ifeq ($(BR2_PACKAGE_JPEG),y)
+LIBCAMERA_DEPENDENCIES += jpeg
+endif
+
+ifeq ($(BR2_PACKAGE_LIBDRM),y)
+LIBCAMERA_DEPENDENCIES += libdrm
+endif
+
+ifeq ($(BR2_PACKAGE_LIBUNWIND),y)
+LIBCAMERA_DEPENDENCIES += libunwind
+endif
+
+ifeq ($(BR2_PACKAGE_SDL2),y)
+LIBCAMERA_DEPENDENCIES += sdl2
+endif
+
 ifeq ($(BR2_PACKAGE_TIFF),y)
 LIBCAMERA_DEPENDENCIES += tiff
 endif