[opus] Opus 1.1's autoconf script is broken

[Brad Smith]

Hi,

Nice to see the 1.1 release is out but unfortunately due to a relatively 
late change to add additional ARM NEON support the commit
in question broke the autoconf script..

checking for C99 variable-size arrays... yes
checking for cos in -lm... (cached) yes
/home/ports/pobj/opus-1.1/opus-1.1/configure[12816]: 
${inline_optimization:0:3}": bad substitution

AM_CONDITIONAL([OPUS_ARM_INLINE_ASM],
     [test x"${inline_optimization:0:3}" = x"ARM"])
AM_CONDITIONAL([OPUS_ARM_EXTERNAL_ASM],
     [test x"${asm_optimization:0:3}" = x"ARM"])

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