MIPS DSPr2: Fix compiler warning with -mdspr2

If -mdspr2 is passed to the compiler, __mips_dsp will be defined, and
__mips_dsp_rev will be >= 2, so parse_proc_cpuinfo() will not be used.
diff --git a/simd/mips/jsimd.c b/simd/mips/jsimd.c
index 790e91f..4cf7e2c 100644
--- a/simd/mips/jsimd.c
+++ b/simd/mips/jsimd.c
@@ -29,7 +29,7 @@
 
 static unsigned int simd_support = ~0;
 
-#if defined(__linux__)
+#if !(defined(__MIPSEL__) && defined(__mips_dsp) && (__mips_dsp_rev >= 2)) && defined(__linux__)
 
 LOCAL(void)
 parse_proc_cpuinfo(const char *search_string)