Compare project names instead of dirs.

Allows top-level wrapper CMakeLists.txt files to work (as long as
their project name is right).

src/build/SynchronetMacros.cmake

@@ -5,7 +5,7 @@ if(MSVC)
 endif()
 
 macro(double_require_lib_dir TARGET LIB LIBDIR)
-	if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_LIST_DIR}")
+	if("${CMAKE_PROJECT_NAME}" STREQUAL "${PROJECT_NAME}")
 		if(NOT DEFINED ${LIBDIR}_DONE)
 			add_subdirectory(../../${LIBDIR} ${LIB} EXCLUDE_FROM_ALL)
 			set(${LIBDIR}_DONE TRUE)
@@ -32,7 +32,7 @@ macro(double_require_libs TARGET)
 endmacro()
 
 macro(require_lib_dir TARGET LIB LIBDIR)
-	if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_LIST_DIR}")
+	if("${CMAKE_PROJECT_NAME}" STREQUAL "${PROJECT_NAME}")
 		if(NOT DEFINED ${LIBDIR}_DONE)
 			add_subdirectory(../${LIBDIR} ${LIB} EXCLUDE_FROM_ALL)
 			set(${LIBDIR}_DONE TRUE)