added misssing cpp file

Signed-off-by: Michael Pollind <mpollind@gmail.com>

Author: pollend

src/nbl/CMakeLists.txt

@@ -181,6 +181,7 @@ set(NBL_SYSTEM_SOURCES
 	${NBL_ROOT_PATH}/src/nbl/system/CFilePOSIX.cpp
 	${NBL_ROOT_PATH}/src/nbl/system/CSystemWin32.cpp
 	${NBL_ROOT_PATH}/src/nbl/system/CSystemAndroid.cpp
+	${NBL_ROOT_PATH}/src/nbl/system/ISystemPOSIX.cpp
 	${NBL_ROOT_PATH}/src/nbl/system/CSystemLinux.cpp
 )
 set(NBL_UI_SOURCES
@@ -429,6 +430,7 @@ if (UNIX)
 		${CMAKE_THREAD_LIBS_INIT}
 		${CMAKE_DL_LIBS}
 	)
+	target_link_libraries(Nabla PUBLIC atomic)
 endif()
 # OpenSSL
 if(ANDROID AND NOT "${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "Windows") # OpenSSL can't be built for Android platform using windows OS host

src/nbl/system/ISystemPOSIX.cpp

@@ -6,7 +6,7 @@
 using namespace nbl;
 using namespace nbl::system;
 
-#if defined(_NBL_PLATFORM_LINUX_) || defined (_NBL_PLATFORM_ANDROID_)
+#if defined(_NBL_PLATFORM_LINUX_) || defined(_NBL_PLATFORM_ANDROID_)
 
 #include <fcntl.h>
 #include <sys/mman.h>