Removed a stray comma in the Android toolchain file.

It was actually acting as an additional argument, breaking the error message.

platforms/android/android.toolchain.cmake

@@ -715,7 +715,7 @@ __INIT_VARIABLE( ANDROID_ABI OBSOLETE_ARM_TARGET OBSOLETE_ARM_TARGETS VALUES ${A
 # verify that target ABI is supported
 list( FIND ANDROID_SUPPORTED_ABIS "${ANDROID_ABI}" __androidAbiIdx )
 if( __androidAbiIdx EQUAL -1 )
- string( REPLACE ";" "\", \"", PRINTABLE_ANDROID_SUPPORTED_ABIS  "${ANDROID_SUPPORTED_ABIS}" )
+ string( REPLACE ";" "\", \"" PRINTABLE_ANDROID_SUPPORTED_ABIS  "${ANDROID_SUPPORTED_ABIS}" )
  message( FATAL_ERROR "Specified ANDROID_ABI = \"${ANDROID_ABI}\" is not supported by this cmake toolchain or your NDK/toolchain.
    Supported values are: \"${PRINTABLE_ANDROID_SUPPORTED_ABIS}\"
    " )