build: use explicit file list for liblmdb in CMake instead of GLOB

file(GLOB) + regex FILTER didn't work reliably on Windows. Replace with
explicit listing of mdb.c + midl.c (same as autotools).

tools/chatgui/libutun/CMakeLists.txt

@@ -8,8 +8,12 @@ set(TRANSPORT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../transport)
 # libuasync — low-level runtime library
 # ============================================================================
 
-file(GLOB UASYNC_SOURCES "${LIB_DIR}/*.c" "${LIB_DIR}/liblmdb/*.c")
-list(FILTER UASYNC_SOURCES EXCLUDE REGEX "/lmdb/(mtest[0-9]*\\.c|mtest\\.c|mdb_copy\\.c|mdb_dump\\.c|mdb_load\\.c|mdb_stat\\.c|mplay\\.c)$")
+file(GLOB UASYNC_SOURCES "${LIB_DIR}/*.c")
+set(UASYNC_LMDB_SOURCES
+    "${LIB_DIR}/liblmdb/mdb.c"
+    "${LIB_DIR}/liblmdb/midl.c"
+)
+list(APPEND UASYNC_SOURCES ${UASYNC_LMDB_SOURCES})
 
 add_library(uasync STATIC ${UASYNC_SOURCES})