fix: cmake typos

Author: qubka

CMakeLists.txt

@@ -44,9 +44,9 @@ endif()
 
 set(COMPILE_DEFINITIONS
 	DYNLIBUTILS_SEPARATE_SOURCE_FILES
-	DYNLIBUTILS_PLATFORM_LINUX=${LINUX}
-	DYNLIBUTILS_PLATFORM_WINDOWS=${WIN32}
-	DYNLIBUTILS_PLATFORM_APPLE=${APPLE}
+	DYNLIBUTILS_PLATFORM_LINUX=$<BOOL:${LINUX}>
+	DYNLIBUTILS_PLATFORM_WINDOWS=$<BOOL:${WIN32}>
+	DYNLIBUTILS_PLATFORM_APPLE=$<BOOL:${APPLE}>
 )
 
 set(INCLUDE_DIRS