Check if we can use inline asm code, not only on x86_64

configure.ac

@@ -580,6 +580,18 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    CPPFLAGS="$CPPFLAGS -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS"
 ])
 
+AC_MSG_CHECKING(whether we can use inline asm code)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+]], [[
+int a = 42;
+int *pnt = &a;
+__asm__ __volatile__ ("" : : "r"(pnt) : "memory");
+]])],
+  [AC_MSG_RESULT(yes)
+   AC_DEFINE([HAVE_INLINE_ASM], [1], [inline asm code can be used])]
+  [AC_MSG_RESULT(no)]
+)
+
 HAVE_AMD64_ASM_V=0
 AS_IF([test "$enable_asm" != "no"],[
   AC_MSG_CHECKING(whether we can use x86_64 asm code)

src/libsodium/sodium/utils.c

@@ -113,7 +113,7 @@ sodium_memzero(void *const pnt, const size_t len)
 #elif HAVE_WEAK_SYMBOLS
     memset(pnt, 0, len);
     _sodium_dummy_symbol_to_prevent_memzero_lto(pnt, len);
-# ifdef HAVE_AMD64_ASM
+# ifdef HAVE_INLINE_ASM
     __asm__ __volatile__ ("" : : "r"(pnt) : "memory");
 # endif
 #else