small bugfixes, adds some half point functionality

src/vm/fp_functions.h

@@ -39,6 +39,8 @@
 
 extern "C" {
 uint32_t fget_flags();
+uint16_t fsqrt_h(uint16_t v1, uint8_t mode);
+uint16_t fclass_h(uint16_t v1);
 uint16_t frsqrt7_h(uint16_t v);
 uint16_t frec7_h(uint16_t v, uint8_t mode);
 uint32_t fadd_s(uint32_t v1, uint32_t v2, uint8_t mode);