[ion] Correct random() implementation in simulator, blackbox and

emscripten

ion/src/blackbox/Makefile

@@ -11,6 +11,7 @@ objs += $(addprefix ion/src/shared/, \
   crc32.o \
   events.o \
   power.o \
+  random.o \
   dummy/backlight.o \
   dummy/battery.o \
   dummy/events_modifier.o \
@@ -24,7 +25,6 @@ objs += $(addprefix ion/src/shared/, \
 ion/src/shared/log_printf.o: SFLAGS=-Iion/include
 ion/src/shared/console_stdio.o: SFLAGS=-Iion/include
 ion/src/shared/events_stdin.o: SFLAGS=-Iion/include
-ion/src/shared/random.o: SFLAGS=-Iion/include
 
 SFLAGS += `libpng-config --cflags`
 LDFLAGS += `libpng-config --ldflags`

ion/src/emscripten/Makefile

@@ -9,6 +9,7 @@ objs += $(addprefix ion/src/shared/, \
   events.o \
   events_modifier.o \
   power.o \
+  random.o \
   dummy/backlight.o \
   dummy/battery.o \
   dummy/fcc_id.o \

ion/src/shared/random.cpp

@@ -2,5 +2,11 @@
 #include <stdlib.h>
 
 uint32_t Ion::random() {
-  return rand();
+  /* rand() returns a pseudo-random integral number in the range between 0 and
+   * RAND_MAX which is garantueed to be at least 32767.*/
+  uint32_t result = 0;
+  for (int i = 0; i < 131077; i++) {
+    result += rand();
+  }
+  return result;
 }