Fix clean builds when CMake is using Unix Makefiles

The `$<TARGET_FILE:binaryninjaapi>` syntax does not do what is intended
for Unix Makefiles.

In practice there's no reason for this custom command to depend on the
`binaryninjaapi` target. The Rust API uses core's C APIs directly rather
than via the C++ API, and it already depends on binaryninjacore.h via
`RUST_API_SOURCES`. Since it's running `cargo check` and not doing a
full compilation this header-only dependency is sufficient.

Author: bdash

rust/CMakeLists.txt

@@ -49,7 +49,7 @@ add_custom_command(
 	COMMAND ${CMAKE_COMMAND} -E env BINARYNINJADIR=${BN_INSTALL_BIN_DIR} ${RUSTUP_CHECK_COMMAND} ${CARGO_CHECK_OPTS}
 	COMMAND ${CMAKE_COMMAND} -E touch ${PROJECT_BINARY_DIR}/rust_api.stamp
 	WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-	DEPENDS ${RUST_API_SOURCES} $<TARGET_FILE:binaryninjaapi>
+	DEPENDS ${RUST_API_SOURCES}
 	COMMENT "Checking Rust API"
 	VERBATIM
 )