use dlfcn, even on Windows

There's such a library on MSYS2. Use it.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

include/dynloader.h

@@ -8,24 +8,14 @@
 
 #include <stdlib.h>
 
-#ifdef _WIN
-#include <windows.h>
-#else
 #include <dlfcn.h>
 #if defined (__APPLE__)
 #include <mach-o/dyld.h>
 #endif // __APPLE__
-#endif // _WIN
 
-#ifdef _WIN
-hc_dynlib_t  hc_dlopen  (LPCSTR lpLibFileName);
-BOOL         hc_dlclose (hc_dynlib_t hLibModule);
-hc_dynfunc_t hc_dlsym   (hc_dynlib_t hModule, LPCSTR lpProcName);
-#else
 hc_dynlib_t  hc_dlopen  (const char *filename);
 int          hc_dlclose (hc_dynlib_t handle);
 hc_dynfunc_t hc_dlsym   (hc_dynlib_t handle, const char *symbol);
-#endif
 
 #define HC_LOAD_FUNC2(ptr,name,type,var,libname,noerr) \
   do { \

src/Makefile

@@ -387,6 +387,7 @@ LFLAGS_NATIVE           += -Wl,--dynamicbase
 LFLAGS_NATIVE           += -Wl,--nxcompat
 LFLAGS_NATIVE           += -lpsapi
 LFLAGS_NATIVE           += -liconv
+LFLAGS_NATIVE           += -ldl
 LFLAGS_NATIVE           += -lws2_32
 LFLAGS_NATIVE           += -lpowrprof
 endif # MSYS2

src/dynloader.c

@@ -7,25 +7,6 @@
 #include "types.h"
 #include "dynloader.h"
 
-#ifdef _WIN
-
-hc_dynlib_t hc_dlopen (LPCSTR lpLibFileName)
-{
-  return LoadLibraryA (lpLibFileName);
-}
-
-BOOL hc_dlclose (hc_dynlib_t hLibModule)
-{
-  return FreeLibrary (hLibModule);
-}
-
-hc_dynfunc_t hc_dlsym (hc_dynlib_t hModule, LPCSTR lpProcName)
-{
-  return GetProcAddress (hModule, lpProcName);
-}
-
-#else
-
 hc_dynlib_t hc_dlopen (const char *filename)
 {
   return dlopen (filename, RTLD_NOW);
@@ -40,5 +21,3 @@ hc_dynfunc_t hc_dlsym (hc_dynlib_t handle, const char *symbol)
 {
   return dlsym (handle, symbol);
 }
-
-#endif