chore(build): remove unneeded stuff

CMakeLists.txt

@@ -15,10 +15,6 @@ endif()
 
 set(ENV{PKG_CONFIG_PATH}
   ${CMAKE_SOURCE_DIR}/libs/lib/pkgconfig:/opt/ffmpeg/lib/pkgconfig:$ENV{PKG_CONFIG_PATH})
-set(ENV{PKG_CONFIG_PATH_i686_w64_mingw32_shared}
-  ${CMAKE_SOURCE_DIR}/libs/lib/pkgconfig)
-set(ENV{PKG_CONFIG_PATH_x86_64_w64_mingw32_shared}
-  ${CMAKE_SOURCE_DIR}/libs/lib/pkgconfig)
 
 execute_process(
   COMMAND brew --prefix qt5

windows/toolchain-x86_64-w64-mingw32.cmake

@@ -6,9 +6,6 @@ SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
 SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
 SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
 
-# here is the target environment located
-SET(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} /usr/x86_64-w64-mingw32)
-
 # adjust the default behaviour of the FIND_XXX() commands:
 # search headers and libraries in the target environment, search
 # programs in the host environment