Include forgotten header files

In some C test programs the function declaration header files
have been missing

test/c_test_programs/elpa1_test_complex_c_version.c

@@ -49,6 +49,7 @@
 #include <math.h>
 
 #include <elpa/elpa.h>
+#include <test/shared_sources/generated.h>
 #include <complex.h>
 
 int main(int argc, char** argv) {

test/c_test_programs/elpa2_test_complex_c_version.c

@@ -49,6 +49,7 @@
 #include <math.h>
 
 #include <elpa/elpa.h>
+#include <test/shared_sources/generated.h>
 #include <complex.h>
 
 int main(int argc, char** argv) {

test/c_test_programs/elpa2_test_real_c_version.c

@@ -49,6 +49,7 @@
 #include <math.h>
 
 #include <elpa/elpa.h>
+#include <test/shared_sources/generated.h>
 
 int main(int argc, char** argv) {
    int myid;

test/shared_sources/prepare_matrix.F90

@@ -147,7 +147,7 @@ module mod_prepare_matrix
       call prepare_matrix_real(na, myid, sc_desc, iseed, a, z, as)
     end subroutine
     !c> void prepare_matrix_complex_from_fortran(int na, int myid, int na_rows, int na_cols,
-    !c>                                       int sc_desc[9], int iseed[4096],
+    !c>                                       int sc_desc[9], int iseed[4096], double *xr,
     !c>                                       complex double *a, complex double *z, complex double *as);
     subroutine prepare_matrix_complex_wrapper(na, myid, na_rows, na_cols, sc_desc, iseed, xr, a, z, as) &
                                           bind(C, name="prepare_matrix_complex_from_fortran")