Add void to create proper prototype to please clang-15

Author: eddelbuettel

ChangeLog

@@ -1,5 +1,7 @@
 2022-11-04  Dirk Eddelbuettel  <edd@debian.org>
 
+	* src/init.c: Add 'void' for proper prototype pleasing clang-15
+
 	* R/fastLm.R (summary.fastLm,print.fastLm): Refer to correct and full
 	variable name df.residual in the returned object
 

src/init.c

@@ -3,12 +3,12 @@
 #include <stdlib.h> // for NULL
 #include <R_ext/Rdynload.h>
 
-/* FIXME: 
+/* FIXME:
    Check these declarations against the C/Fortran source code.
 */
 
 /* .Call calls */
-extern SEXP RcppEigen_Eigen_SSE();
+extern SEXP RcppEigen_Eigen_SSE(void);
 extern SEXP RcppEigen_eigen_version(SEXP);
 extern SEXP RcppEigen_fastLm_Impl(SEXP, SEXP, SEXP);