#380 Fix compilation error and logic bug in mosaic_util.nc

This change resolves a build failure in mosaic_util.c where
a static const double array (m[3][3])was being initialized
with variables calculated at runtime. Standard C requires static
variables to be initialized with compile-time constants,
which caused GCC to throw an "initializer element is not constant" error.

Removing the static keyword not only fixes the compilation issue but also corrects a likely logic bug. As an automatic local variable, the rotation matrix will now accurately populate with fresh, updated values on every function call, ensuring mathematical correctness and thread safety.

Author: ceblanton

lib/libfrencutils/mosaic_util.c

@@ -1691,13 +1691,13 @@ int crosses_pole(const double x[] , int n) {
 void set_the_rotation_matrix() {
   static const double is2 = 1.0 /M_SQRT2;
 
-  static const double m00 = 0;
-  static const double m01 = - is2;
-  static const double m02 = is2;
-  static const double m11 = 1.0/2;
-  static const double m12 = 0.5;
+  const double m00 = 0;
+  const double m01 = - is2;
+  const double m02 = is2;
+  const double m11 = 1.0/2;
+  const double m12 = 0.5;
 
-  static const double m[3][3] = { {m00, m01, m02}, {m02, m11, m12},{m01, m12, m11} };
+  const double m[3][3] = { {m00, m01, m02}, {m02, m11, m12},{m01, m12, m11} };
 
   for (int i = 0; i < 3; i++) {
     for (int j = 0; j < 3; j++) {