optimized lapack' SVD for noticeably better performance on small matrices

3rdparty/include/f2c.h

@@ -7,6 +7,7 @@
 #ifndef F2C_INCLUDE
 #define F2C_INCLUDE
 
+#include <assert.h>
 #include <math.h>
 #include <ctype.h>
 #include <stdlib.h>
@@ -17,6 +18,10 @@
 #include <string.h>
 #include <stdio.h>
 
+#if __SSE2__ || defined _M_X64
+#include "emmintrin.h"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif