Microchip can't make up thier mind on what they want to call things. In most 16F's it's called T0IF, and in the 18F's it's TMR0IF, but for some reason, in a 16F88 it's also called TMR0IF. It's the same with the T0IE/TMR0IE.

Fortunately, we aren't stuck with whatever they decide to call things.

Just add the 2 highlighted lines, and you should be fine. (no spaces before them)
Code:
ASM
T0IF = TMR0IF
T0IE = TMR0IE
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
        INT_Handler   TMR0_INT,  _ToggleLED2,   PBP,  yes
        INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor

    INT_ENABLE   INT_INT     ; enable external (INT) interrupts
    INT_ENABLE  TMR0_INT     ; enable Timer 0 interrupts
    INT_ENABLE  TMR1_INT     ; Enable Timer 1 Interrupts  
ENDASM