patch 8.0.0199: compiler warnings for libcall

Problem:    Warning for an unused parameter when the libcall feature is
            disabled.  Warning for a function type cast when compiling with
            -pedantic.
Solution:   Add UNUSED.  Use a different type cast. (Damien Molinier)

Author: brammool

src/evalfunc.c

@@ -6859,10 +6859,8 @@ f_len(typval_T *argvars, typval_T *rettv)
     }
 }
 
-static void libcall_common(typval_T *argvars, typval_T *rettv, int type);
-
     static void
-libcall_common(typval_T *argvars, typval_T *rettv, int type)
+libcall_common(typval_T *argvars UNUSED, typval_T *rettv, int type)
 {
 #ifdef FEAT_LIBCALL
     char_u		*string_in;

src/os_unix.c

@@ -6918,7 +6918,7 @@ mch_libcall(
 	    if (argstring != NULL)
 	    {
 # if defined(USE_DLOPEN)
-		ProcAdd = (STRPROCSTR)dlsym(hinstLib, (const char *)funcname);
+		*(void **)(&ProcAdd) = dlsym(hinstLib, (const char *)funcname);
 		dlerr = (char *)dlerror();
 # else
 		if (shl_findsym(&hinstLib, (const char *)funcname,
@@ -6940,7 +6940,7 @@ mch_libcall(
 	    else
 	    {
 # if defined(USE_DLOPEN)
-		ProcAddI = (INTPROCSTR)dlsym(hinstLib, (const char *)funcname);
+		*(void **)(&ProcAddI) = dlsym(hinstLib, (const char *)funcname);
 		dlerr = (char *)dlerror();
 # else
 		if (shl_findsym(&hinstLib, (const char *)funcname,

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    199,
 /**/
     198,
 /**/