Don't use time() in emulating chips

Instead of using time() in chip emulation, create new interface method
currentTime(), defaulting to time(0). This way frontend can cleanly
override the current time bsnes is using.

snes/chip/bsx/satellaview/satellaview.cpp

@@ -39,7 +39,7 @@ uint8 BSXSatellaview::mmio_read(unsigned addr) {
 
       if(counter == 0) {
         time_t rawtime;
-        time(&rawtime);
+        rawtime = SNES::interface->currentTime();
         tm *t = localtime(&rawtime);
 
         regs.r2192_hour   = t->tm_hour;

snes/chip/spc7110/spc7110.cpp

@@ -102,7 +102,7 @@ void SPC7110::set_data_adjust(unsigned addr)  { r4814 = addr; r4815 = addr >> 8;
 
 void SPC7110::update_time(int offset) {
   time_t rtc_time = (rtc[16] << 0) | (rtc[17] << 8) | (rtc[18] << 16) | (rtc[19] << 24);
-  time_t current_time = time(0) - offset;
+  time_t current_time = SNES::interface->currentTime() - offset;
 
   //sizeof(time_t) is platform-dependent; though rtc[] needs to be platform-agnostic.
   //yet platforms with 32-bit signed time_t will overflow every ~68 years. handle this by

snes/chip/srtc/srtc.cpp

@@ -32,7 +32,7 @@ void SRTC::reset() {
 
 void SRTC::update_time() {
   time_t rtc_time = (rtc[16] << 0) | (rtc[17] << 8) | (rtc[18] << 16) | (rtc[19] << 24);
-  time_t current_time = time(0);
+  time_t current_time = SNES::interface->currentTime();
 
   //sizeof(time_t) is platform-dependent; though rtc[] needs to be platform-agnostic.
   //yet platforms with 32-bit signed time_t will overflow every ~68 years. handle this by

snes/interface/interface.cpp

@@ -18,4 +18,9 @@ void Interface::message(const string &text) {
   print(text, "\n");
 }
 
+time_t Interface::currentTime()
+{
+  return time(0);
+}
+
 }

snes/interface/interface.hpp

@@ -5,6 +5,7 @@ struct Interface {
 
   virtual string path(Cartridge::Slot slot, const string &hint) = 0;
   virtual void message(const string &text);
+  virtual time_t currentTime();
 };
 
 extern Interface *interface;