Change library name to cpp-httplib (#1854)

CMakeLists.txt

@@ -194,6 +194,7 @@ if(HTTPLIB_COMPILE)
 		PROPERTIES
 			VERSION ${${PROJECT_NAME}_VERSION}
 			SOVERSION "${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}"
+			OUTPUT_NAME cpp-httplib
 	)
 else()
 	# This is for header-only.