Fix function declaration warnings with clang (#226)

This fixes the following compiler warnings with clang

tools/genperf/perfect.c:65:6: warning: a function definition without a prototype
is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]

frontends/yasm/yasm.c:1379:23: warning: a function declaration without a prototype
is deprecated in all versions of C [-Wstrict-prototypes]

modules/objfmts/elf/elf.c:225:18: warning: a function declaration without a prototype
is deprecated in all versions of C [-Wstrict-prototypes]

frontends/tasm/tasm.c

@@ -817,7 +817,7 @@ opt_exe_handler(char *cmd, /*@unused@*/ char *param, int extra)
 }
 
 static void
-apply_preproc_builtins()
+apply_preproc_builtins(void)
 {
     char *predef;
 
@@ -853,7 +853,7 @@ apply_preproc_standard_macros(const yasm_stdmac *stdmacs)
 }
 
 static void
-apply_preproc_saved_options()
+apply_preproc_saved_options(void)
 {
     constcharparam *cp, *cpnext;
 

frontends/yasm/yasm.c

@@ -1376,7 +1376,7 @@ opt_plugin_handler(/*@unused@*/ char *cmd, char *param,
 #endif
 
 static void
-apply_preproc_builtins()
+apply_preproc_builtins(void)
 {
     char *predef;
 
@@ -1409,7 +1409,7 @@ apply_preproc_standard_macros(const yasm_stdmac *stdmacs)
 }
 
 static void
-apply_preproc_saved_options()
+apply_preproc_saved_options(void)
 {
     constcharparam *cp, *cpnext;
 

modules/objfmts/elf/elf.c

@@ -222,7 +222,7 @@ elf_strtab_entry_set_str(elf_strtab_entry *entry, const char *str)
 }
 
 elf_strtab_head *
-elf_strtab_create()
+elf_strtab_create(void)
 {
     elf_strtab_head *strtab = yasm_xmalloc(sizeof(elf_strtab_head));
     elf_strtab_entry *entry = yasm_xmalloc(sizeof(elf_strtab_entry));
@@ -373,7 +373,7 @@ elf_ssym_symtab_entry_print(void *data, FILE *f, int indent_level)
 }
 
 elf_symtab_head *
-elf_symtab_create()
+elf_symtab_create(void)
 {
     elf_symtab_head *symtab = yasm_xmalloc(sizeof(elf_symtab_head));
     elf_symtab_entry *entry = yasm_xmalloc(sizeof(elf_symtab_entry));

tools/genperf/perfect.c

@@ -62,8 +62,7 @@ Find the mapping that will produce a perfect hash
 */
 
 /* return the ceiling of the log (base 2) of val */
-ub4  phash_log2(val)
-ub4  val;
+ub4  phash_log2(ub4 val)
 {
   ub4 i;
   for (i=0; ((ub4)1<<i) < val; ++i)