Try compat with multistart (thread-safe) and fix some type (for CRAN warning)

Lbfgsb.3.0/include/lbfgsb/lbfgsb.h

@@ -1,22 +1,35 @@
+// Type definitions from f2c - must match local_f2c.h
+#include <stdint.h>
+
+typedef int32_t integer;
+typedef double doublereal;
+typedef int32_t logical;
+
+#ifdef f2c_i2
+typedef int16_t ftnlen;
+#else
+typedef int32_t ftnlen;
+#endif
+
 extern "C" {
-void setulb_(const int* n,
-             const int* m,
-             double* x,
-             const double* l,
-             const double* u,
-             const int* nbd,
-             double* f,
-             double* g,
-             const double* factr,
-             const double* pgtol,
-             double* wa,
-             int* iwa,
-             char* task,
-             const int* iprint,
-             char* csave,
-             bool* lsave,
-             int* isave,
-             double* dsave,
-             size_t len_task,
-             size_t len_csave);
+int setulb_(integer* n,
+            integer* m,
+            doublereal* x,
+            doublereal* l,
+            doublereal* u,
+            integer* nbd,
+            doublereal* f,
+            doublereal* g,
+            doublereal* factr,
+            doublereal* pgtol,
+            doublereal* wa,
+            integer* iwa,
+            char* task,
+            integer* iprint,
+            char* csave,
+            logical* lsave,
+            integer* isave,
+            doublereal* dsave,
+            ftnlen task_len,
+            ftnlen csave_len);
 }