cmake: sort package in header

cmake/CMakeLists.txt

@@ -1008,7 +1008,9 @@ include_directories(${LAMMPS_STYLE_HEADERS_DIR})
 ######################################
 set(temp "#ifndef LMP_INSTALLED_PKGS_H\n#define LMP_INSTALLED_PKGS_H\n")
 set(temp "${temp}const char * LAMMPS_NS::LAMMPS::installed_packages[] =  {\n")
-foreach(PKG ${DEFAULT_PACKAGES} ${ACCEL_PACKAGES} ${OTHER_PACKAGES})
+set(temp_PKG_LIST ${DEFAULT_PACKAGES} ${ACCEL_PACKAGES} ${OTHER_PACKAGES})
+list(SORT temp_PKG_LIST)
+foreach(PKG ${temp_PKG_LIST})
     if(PKG_${PKG})
         set(temp "${temp}  \"${PKG}\",\n")
     endif()