crt: Cleanup _scprintf/_vscprintf for non-msvcrtos builds

For non-msvcrtos builds are global variables __MINGW_IMP_SYMBOL(_scprintf)
__MINGW_IMP_SYMBOL(_vscprintf) not changing, they are constant.

So define _scprintf and _vscprintf functions as direct alias to
emu_scprintf and emu_vscprintf functions instead of via indirect
unconditional jump or function call.

This also simplifies _scprintf definition for non-msvcrtos builds as it
reduces usage of inline assembly code.

There is no change for msvcrtos build.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-crt/stdio/_scprintf.c

diff --git a/mingw-w64-crt/stdio/_scprintf.c b/mingw-w64-crt/stdio/_scprintf.c
index bcee08a..42f2e5f 100644
--- a/mingw-w64-crt/stdio/_scprintf.c
+++ b/mingw-w64-crt/stdio/_scprintf.c
@@ -22,17 +22,8 @@
 
 #ifndef __LIBMSVCRT_OS__
 
-int (__cdecl *__MINGW_IMP_SYMBOL(_scprintf))(const char * __restrict__, ...) = emu_scprintf;
-
-/* gcc does not provide an easy way to call another variadic function with reusing current arguments
- * this source file is used only on i386, so do this function redirect via inline i386 assembly */
-#define ASM_SYM(sym) __MINGW64_STRINGIFY(__MINGW_USYMBOL(sym))
-asm (
-".globl\t" ASM_SYM(_scprintf) "\n\t"
-".def\t" ASM_SYM(_scprintf) ";\t.scl\t2;\t.type\t32;\t.endef\n"
-ASM_SYM(_scprintf) ":\n\t"
-    "jmp\t*" ASM_SYM(__MINGW_IMP_SYMBOL(_scprintf))
-);
+int __attribute__ ((alias ("emu_scprintf"))) __cdecl _scprintf (const char * __restrict__, ...);
+int (__cdecl *__MINGW_IMP_SYMBOL(_scprintf))(const char * __restrict__, ...) = _scprintf;
 
 #else
 

mingw-w64-crt/stdio/_vscprintf.c

diff --git a/mingw-w64-crt/stdio/_vscprintf.c b/mingw-w64-crt/stdio/_vscprintf.c
index bb596b4..cc11473 100644
--- a/mingw-w64-crt/stdio/_vscprintf.c
+++ b/mingw-w64-crt/stdio/_vscprintf.c
@@ -54,7 +54,8 @@
 
 #ifndef __LIBMSVCRT_OS__
 
-int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = emu_vscprintf;
+int __attribute__ ((alias ("emu_vscprintf"))) __cdecl _vscprintf (const char * __restrict__, va_list);
+int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = _vscprintf;
 
 #else
 
@@ -78,9 +79,9 @@
     return (__MINGW_IMP_SYMBOL(_vscprintf) = func)(format, arglist);
 }
 
-#endif
-
 int __cdecl _vscprintf(const char * __restrict__ format, va_list arglist)
 {
     return __MINGW_IMP_SYMBOL(_vscprintf)(format, arglist);
 }
+
+#endif