std.cfg: Added <not-bool/>-tag to isblank() function arg.

cfg/std.cfg

@@ -2557,6 +2557,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-uninit/>
+      <not-bool/>
       <valid>0:255</valid>
     </arg>
   </function>

test/cfg/std.c

@@ -3986,6 +3986,14 @@ bool invalidFunctionArgBool_isprint(bool b, int c)
     return isprint(c != 0);
 }
 
+bool invalidFunctionArgBool_isblank(bool b, int c)
+{
+    // cppcheck-suppress invalidFunctionArgBool
+    (void)isblank(b);
+    // cppcheck-suppress invalidFunctionArgBool
+    return isblank(c != 0);
+}
+
 bool invalidFunctionArgBool_ispunct(bool b, int c)
 {
     // cppcheck-suppress invalidFunctionArgBool