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m4: fix -Wstrict-protoypes

In preparation for C23. Fixes the following error if Clang 16 is
cranked up to be stricter:
```
-warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
+error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
```

Bug: https://bugs.gentoo.org/879707
Signed-off-by: Sam James <sam@gentoo.org>

--- a/m4/attributes.m4

+++ b/m4/attributes.m4

@@ -39,7 +39,7 @@

   AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),

     [ac_save_CFLAGS="$CFLAGS"

      CFLAGS="$CFLAGS $1"

-     AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])],

+     AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; }])],

        [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],

        [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])

      CFLAGS="$ac_save_CFLAGS"

@@ -89,7 +89,7 @@

     AS_TR_SH([cc_cv_ldflags_$1]),

     [ac_save_LDFLAGS="$LDFLAGS"

      LDFLAGS="$LDFLAGS $1"

-     AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 1; }])],

+     AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 1; }])],

        [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],

        [eval "AS_TR_SH([cc_cv_ldflags_$1])="])

      LDFLAGS="$ac_save_LDFLAGS"

@@ -165,8 +165,8 @@

 AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [

   CC_CHECK_ATTRIBUTE(

     [constructor],,

-    [extern void foo();

-     void __attribute__((constructor)) ctor() { foo(); }],

+    [extern void foo(void);

+     void __attribute__((constructor)) ctor(void) { foo(); }],

     [$1], [$2])

 ])

@@ -173,8 +173,8 @@

 AC_DEFUN([CC_ATTRIBUTE_DESTRUCTOR], [

   CC_CHECK_ATTRIBUTE(

     [destructor],,

-    [extern void foo();

-     void __attribute__((destructor)) dtor() { foo(); }],

+    [extern void foo(void);

+     void __attribute__((destructor)) dtor(void) { foo(); }],

     [$1], [$2])

 ])

@@ -195,7 +195,7 @@

 AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [

   CC_CHECK_ATTRIBUTE(

     [visibility_$1], [visibility("$1")],

-    [void __attribute__((visibility("$1"))) $1_function() { }],

+    [void __attribute__((visibility("$1"))) $1_function(void) { }],

     [$2], [$3])

 ])

@@ -306,7 +306,7 @@

      CFLAGS="$CFLAGS $cc_cv_werror"

      for cc_attribute_align_try in 64 32 16 8 4 2; do

         AC_COMPILE_IFELSE([AC_LANG_SOURCE([

-          int main() {

+          int main(void) {

             static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;

             return c;

           }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])