[e2k] add lcc support

lcc compiler on e2k architecture doesn't support dynamic vector
inialization before version 1.23 (and we currently use 1.21);
avoid that.

Author: Andrey Savchenko <bircoph@altlinux.org>

--- audacity/lib-src/sbsms/src/fft.h.orig	2018-03-17 23:04:16.000000000 +0300
+++ audacity/lib-src/sbsms/src/fft.h	2018-03-18 12:21:53.114096851 +0300
@@ -332,8 +332,12 @@
     for(int k=0; k<N; k++) {
       float c = cos(TWOPI * (float)k / (float)N);
       float s = sin(TWOPI * (float)(-dir*k) / (float)N);
+#if !(defined(__LCC__) && __LCC__ <= 121)
       simd_vector v = {c,s,c,-s};
       cs[k] = v;
+#else
+      cs[k] = _mm_set_ps(c,s,c,-s);
+#endif
     }
   }
 };