FPU tests are not compiling if rvtest_mtrap_routine is defined

[algrobman]

from fadd_b1-01.S:

signature_x1_5:
    .fill 136*((SIGALIGN)/4),4,0xdeadbeef

#ifdef rvtest_mtrap_routine

**tsig_begin_canary:**
CANARY;
**tsig_begin_canary:**
CANARY;
mtrap_sigptr:
    .fill 64*(XLEN/32),4,0xdeadbeef
**tsig_end_canary:**
CANARY;
**tsig_end_canary:**
CANARY;

#endif

the tsig_begin_canary:, tsig_end_canary: defined twice ???