driver/apdu/at: fix conditional compile (#165)

resolve #163

Signed-off-by: Celeste <CoelacanthusHex@gmail.com>

driver/CMakeLists.txt

@@ -2,7 +2,11 @@ include(CMakeDependentOption)
 cmake_dependent_option(LPAC_DYNAMIC_DRIVERS "Build lpac/libeuicc driver backends as a dynamic library" OFF "LPAC_DYNAMIC_LIBEUICC" OFF)
 
 option(LPAC_WITH_APDU_PCSC "Build APDU PCSC Backend (requires PCSC libraries)" ON)
-option(LPAC_WITH_APDU_AT "Build APDU AT Backend" Linux)
+if(LINUX)
+    option(LPAC_WITH_APDU_AT "Build APDU AT Backend" ON)
+else()
+    option(LPAC_WITH_APDU_AT "Build APDU AT Backend" OFF)
+endif()
 option(LPAC_WITH_APDU_GBINDER "Build APDU Gbinder backend for libhybris devices (requires gbinder headers)" OFF)
 option(LPAC_WITH_APDU_QMI "Build QMI backend for Qualcomm devices (requires libqmi)" OFF)
 option(LPAC_WITH_APDU_QMI_QRTR "Build QMI-over-QRTR backend for Qualcomm devices (requires libqrtr and libqmi headers)" OFF)