winemaker: Correctly process directories containing regexp metacharacters

[Simon C. Ion]

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Directories with regexp metacharacters in them (like '+') cause some
regexp operation on line 1106 to fail .
The attached patch escapes metacharacters in path component in the
'search_from' function.

Reproduction recipe:

1) Download QT 4.3.1 (Win32) and unpack. [1]
2) cd to qt-win-opensource-src-4.3.1.
3) Run 'winemaker'.

It'll churn for a while, then you get this message:
Nested quantifiers in regex; marked by <-- HERE in m/^linux-g++ <-- HERE
$/ at
/usr/local/bin/winemaker line 1106, <FILEI> line 39.


[1] QT is here:
ftp://ftp.trolltech.com/qt/source/qt-win-opensource-src-4.3.1.zip


This patch currently applies cleanly to git HEAD.


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