Revert fixes for -Wparentheses-equality warnings

It is causing more trouble than it fixes.

This reverts commits

a0bfa5f116a1389c5b67dc87ff94a539c3b00e55
13712b548520fa24e0bdad11695eba0b972f4a19
9aabb018978ca20d89a4c7008aa45130f9df7c28
d0602f25921c9f40e662a63dc6d92f59793e5eb7
127da0e17fe9a162d90cf6168f1cb7b4da825766
e80f30fca069aea488c64bd199bddd5dbc7f4d27
721ec8935989a0af93461b43929376accd0ff749
15dc766e3957da2b754353fb65aa6cda1fc9c875
8598c178e8d814cd25d47a737a941c57233bb4c2
d59c66ad9b05e426b042727fe98208df81bb49f0
f8d364bec788ee1b6beaf593098015c8b860ef25
f118a2de669c4fde0c06751186337ac01a99942b
794fa8c2363f068b5cd3f93e92e01916151c812e
028cbf7ed8b0152805772b41ab7cfa667f920cd1
50def8e56648499c142ab0be68b481bb4d6cfad6
f363fac6e1b3cb5e4e8d16d42480af4d2450f1ad
0506eba76ff023f1b47d28f8eeeaae5796e70804
8e24420869b34fa48bdabe6158e6ae9924b86801
c5f626894f454fc1736d6934ca820d07f64b0df1
texk/web2c/{mplibdir,xetexdir}: Minor updates

git-svn-id: svn://tug.org/texlive/trunk/Build@33182 c570f23f-e606-0410-a88d-b1316a301751