Removed unused errno includes.
diff --git a/src/audio/alsa/SDL_alsa_audio.c b/src/audio/alsa/SDL_alsa_audio.c
index 931cfde..a043ffe 100644
--- a/src/audio/alsa/SDL_alsa_audio.c
+++ b/src/audio/alsa/SDL_alsa_audio.c
@@ -26,7 +26,6 @@
 
 #include <sys/types.h>
 #include <signal.h>             /* For kill() */
-#include <errno.h>
 #include <string.h>
 
 #include "SDL_assert.h"
diff --git a/src/audio/pulseaudio/SDL_pulseaudio.c b/src/audio/pulseaudio/SDL_pulseaudio.c
index a6421ac..b7d1bfe 100644
--- a/src/audio/pulseaudio/SDL_pulseaudio.c
+++ b/src/audio/pulseaudio/SDL_pulseaudio.c
@@ -37,7 +37,6 @@
 #endif
 #include <unistd.h>
 #include <sys/types.h>
-#include <errno.h>
 #include <pulse/pulseaudio.h>
 
 #include "SDL_timer.h"
diff --git a/src/filesystem/android/SDL_sysfilesystem.c b/src/filesystem/android/SDL_sysfilesystem.c
index 2164329..cf26054 100644
--- a/src/filesystem/android/SDL_sysfilesystem.c
+++ b/src/filesystem/android/SDL_sysfilesystem.c
@@ -26,7 +26,6 @@
 /* System dependent filesystem routines                                */
 
 #include <unistd.h>
-#include <errno.h>
 
 #include "SDL_error.h"
 #include "SDL_filesystem.h"