contrib: enable support for custom SDKROOTs without messing with the system...

contrib: enable support for custom SDKROOTs without messing with the system and add support for tvOS

contrib/bootstrap

@@ -158,20 +158,25 @@ add_make_enabled()
 
 check_ios_sdk()
 {
-   if test -z "$SDKROOT"
-   then
-      SDKROOT=`xcode-select -print-path`/Platforms/iPhone${PLATFORM}.platform/Developer/SDKs/iPhone${PLATFORM}${SDK_VERSION}.sdk
-      echo "SDKROOT not specified, assuming $SDKROOT"
-   else
-      SDKROOT="$SDKROOT"
-      fi
+    if test "$VLCSDKROOT"
+    then
+	    SDKROOT="$VLCSDKROOT"
+    else
+		if test -z "$SDKROOT"
+		then
+		   SDKROOT=`xcode-select -print-path`/Platforms/iPhone${PLATFORM}.platform/Developer/SDKs/iPhone${PLATFORM}${SDK_VERSION}.sdk
+		   echo "SDKROOT not specified, assuming $SDKROOT"
+		else
+		   SDKROOT="$SDKROOT"
+		fi
+    fi
 
-   if [ ! -d "${SDKROOT}" ]
-   then
-      echo "*** ${SDKROOT} does not exist, please install required SDK, or set SDKROOT manually. ***"
-      exit 1
-   fi
-   add_make "IOS_SDK=${SDKROOT}"
+    if [ ! -d "${SDKROOT}" ]
+    then
+       echo "*** ${SDKROOT} does not exist, please install required SDK, or set SDKROOT manually. ***"
+       exit 1
+    fi
+    add_make "IOS_SDK=${SDKROOT}"
 }
 
 check_macosx_sdk()
@@ -263,6 +268,10 @@ case "${OS}" in
 				;;
 			esac;
 		fi
+		if test "$BUILDFORTVOS"
+		then
+			add_make_enabled "HAVE_TVOS"
+		fi
 		;;
 	*bsd*)
 		add_make_enabled "HAVE_BSD"

contrib/src/vpx/rules.mak

@@ -91,7 +91,11 @@ VPX_CONF += --sdk-path=$(MACOSX_SDK)
 endif
 ifdef HAVE_IOS
 VPX_CONF += --sdk-path=$(IOS_SDK) --enable-vp8-decoder --disable-vp8-encoder --disable-vp9-encoder
+ifdef HAVE_TVOS
+VPX_LDFLAGS := -L$(IOS_SDK)/usr/lib -isysroot $(IOS_SDK) -mtvos-version-min=9.0
+else
 VPX_LDFLAGS := -L$(IOS_SDK)/usr/lib -isysroot $(IOS_SDK) -miphoneos-version-min=6.1
+endif
 ifeq ($(ARCH),aarch64)
 VPX_LDFLAGS += -arch arm64
 else