Remove internal conditionals to use defined flag

core/deps/libpng/pngpriv.h

@@ -48,7 +48,7 @@
       * <fp.h> if possible.
       */
 #    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
-#        if TARGET_OS_IPHONE
+#        if TARGET_IPHONE
 #          include "fp.h"
 #        else
 #          include <fp.h>

core/linux/common.cpp

@@ -18,7 +18,7 @@
 #include <sys/param.h>
 #include <sys/mman.h>
 #include <sys/time.h>
-#if !defined(_ANDROID) && !defined(TARGET_OS_IPHONE) && !defined(TARGET_NACL32) && !defined(TARGET_EMSCRIPTEN) && !defined(TARGET_OSX)
+#if !defined(_ANDROID) && !defined(TARGET_IPHONE) && !defined(TARGET_NACL32) && !defined(TARGET_EMSCRIPTEN) && !defined(TARGET_OSX)
   #include <sys/personality.h>
   #include <dlfcn.h>
 #endif
@@ -263,7 +263,7 @@ double os_GetSeconds()
 	return a.tv_sec-tvs_base+a.tv_usec/1000000.0;
 }
 
-#if TARGET_OS_IPHONE
+#if TARGET_IPHONE
 void os_DebugBreak() {
     __asm__("trap");
 }

shell/apple/emulator-ios/emulator/reicast-ios-Prefix.pch

@@ -9,7 +9,6 @@
 #define reicast_ios_reicast_ios_Prefix_pch
 
 #import <Availability.h>
-#import <TargetConditionals.h>
 
 #ifndef __IPHONE_5_0
 #warning "This project uses features only available in iOS SDK 5.0 and later."