[PD] small template bug on 64 bit system for building externals for android

[Cyrille Henry]

Hello,

i'm currently working for android.
when trying to compile pd extern for this platform, I face a small bug on the template makefile v1.0.14

it certainly work great for 32 bit, but on my 64 bit system, i have to change :
   NDK_TOOLCHAIN=$(wildcard $(NDK_BASE)/toolchains/$(NDK_ABI)*-$(NDK_COMPILER_VERSION)/prebuilt/$(NDK_UNAME)-x86)
to
   NDK_TOOLCHAIN=$(wildcard $(NDK_BASE)/toolchains/$(NDK_ABI)*-$(NDK_COMPILER_VERSION)/prebuilt/$(NDK_UNAME)-x86_64)

for now i don't have anything to test, but binary are created.

cheers
c