Fixed CMake install on ARM.

Author: orbitalquark

CMakeLists.txt

@@ -45,19 +45,17 @@ endif()
 # Install.
 install(TARGETS diff DESTINATION ${src})
 if(NOT (WIN32 OR APPLE))
-	if(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch")
-		install(CODE "file(RENAME ${src}/libdiff.so ${src}/diff.so)")
-	else()
-		install(CODE "file(RENAME ${src}/libdiff.so ${src}/diffarm.so)")
+	set(diff_so diff.so)
+	if(CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch")
+		set(diff_so diffarm.so)
 	endif()
-elseif(APPLE)
-	install(CODE "file(RENAME ${src}/libdiff.dylib ${src}/diffosx.so)")
-endif()
-if(NOT (WIN32 OR APPLE))
+	install(CODE "file(RENAME ${src}/libdiff.so ${src}/${diff_so})")
 	include(GNUInstallDirs)
 	set(module_dir ${CMAKE_INSTALL_FULL_DATADIR}/textadept/modules/file_diff)
 	install(CODE "file(MAKE_DIRECTORY ${module_dir})")
-	install(FILES init.lua diff.so DESTINATION ${module_dir})
+	install(FILES init.lua ${diff_so} DESTINATION ${module_dir})
+elseif(APPLE)
+	install(CODE "file(RENAME ${src}/libdiff.dylib ${src}/diffosx.so)")
 endif()
 
 # Documentation.