cosmetics and correction

[Peter S. Mazinger]

Hello!

1. proposal s/USE_SHADOW/UCLIBC_HAS_SHADOW/ change, it is easier to 
find/grep/sed this as to extract from my patch
2. UCLIBC_HAS_WORDEXP needs:
depends on ARCH_USE_MMU (cant recall why)
3. DODEBUG_PT is only meaningful for LINUXTHREADS_OLD, add:
depends on LINUXTHREADS_OLD

Peter

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Peter S. Mazinger <ps dot m at gmx dot net>           ID: 0xA5F059F2
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