configure.ac: recognize the watchOS platform

configure.ac

@@ -118,6 +118,7 @@ HAVE_OSX="0"
 HAVE_TVOS="0"
 HAVE_IOS_OR_TVOS="0"
 HAVE_XROS="0"
+HAVE_WATCHOS="0"
 
 dnl  Set x86 asm flags and defines
 X86ASMFLAGS=""
@@ -250,6 +251,19 @@ int foo() { return my_array[0]; }
              ac_cv_func_fork=no
              ],)
 
+    AC_EGREP_CPP(yes,
+            [#import <TargetConditionals.h>
+             #if TARGET_OS_WATCH
+             yes
+             #endif],
+             [HAVE_WATCHOS="1"
+             HAVE_IOS="0"
+             HAVE_OSX="0"
+             HAVE_TVOS="0"
+             HAVE_IOS_OR_TVOS="0"
+             ac_cv_func_fork=no
+             ],)
+
     AS_IF([test "${HAVE_OSX}" = "1"],[VLC_ADD_LIBS([libvlccore],[-Wl,-framework,CoreServices])])
 
     dnl
@@ -493,6 +507,7 @@ AM_CONDITIONAL([HAVE_OSX],     [test "${HAVE_OSX}" = "1"])
 AM_CONDITIONAL([HAVE_TVOS],    [test "${HAVE_TVOS}" = "1"])
 AM_CONDITIONAL([HAVE_IOS_OR_TVOS], [test "${HAVE_IOS_OR_TVOS}" = "1"])
 AM_CONDITIONAL([HAVE_XROS],    [test "${HAVE_XROS}" = "1"])
+AM_CONDITIONAL([HAVE_WATCHOS],    [test "${HAVE_WATCHOS}" = "1"])
 
 AM_CONDITIONAL([HAVE_LIBANL],  [test "${HAVE_LIBANL}" = "1"])