remove string.h include

vlib/builtin/cfns.v

@@ -1,8 +1,10 @@
 module builtin
 
 
-fn C.memcpy(byteptr, byteptr, int)
-fn C.memmove(byteptr, byteptr, int)
+// <string.h>
+fn memcpy(byteptr, byteptr, int) voidptr
+fn memmove(byteptr, byteptr, int)
+
 //fn C.malloc(int) byteptr
 fn C.realloc(a byteptr, b int) byteptr
 
@@ -14,6 +16,7 @@ fn C.isdigit(s byteptr) bool
 
 
 
+
 // <execinfo.h>
 fn backtrace(a voidptr, b int) int
 fn backtrace_symbols_fd(voidptr, int, int)

vlib/compiler/cc.v

@@ -135,7 +135,7 @@ fn (v mut V) cc() {
 	}
 
 	if v.pref.ccompiler != 'msvc' && v.os != .freebsd {
-		a << '-Werror=implicit-function-declaration'
+		//a << '-Werror=implicit-function-declaration'
 	}
 
 	for f in v.generate_hotcode_reloading_compiler_flags() {

vlib/compiler/cheaders.v

@@ -9,7 +9,7 @@ CommonCHeaders = '
 #include <signal.h>
 #include <stdarg.h> // for va_list
 #include <inttypes.h>  // int64_t etc
-#include <string.h> // memcpy
+//#include <string.h> // memcpy
 
 #ifndef _WIN32
 #include <ctype.h>