[PATCH] RISC-V: Skip zbb-min-max-05.c under -funroll-loops

With -funroll-loops the loop body is duplicated, emitting more than one
minu and breaking the scan-assembler-times {\mminu} 1 expectation.  Skip
the test when -funroll-loops is present, matching zbb-min-max-04.c.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zbb-min-max-05.c: Skip under -funroll-loops.