Remove unnecessary compiler and warning flags from UIKit mkspecs

All of these flags were blindly copied from Xcode and all of them are
not needed because they are unnecessary or at the very least are for no
reason specific to iOS/tvOS/watchOS.

 * -fvisibility=hidden,
   -fvisibility-inlines-hidden - handled in common/gcc-base.conf
 * -fpascal-strings - a Mac OS Classic legacy, no one uses these
 * -fmessage-length=0 - formatting option, not needed
 * -fexceptions, -fasm-blocks - these are on by default and not needed

All explicitly enabled warnings are enabled by -Wall, which is handled
in common/gcc-base.conf. All explicitly disabled warnings should not be
disabled because we simply do not do this anywhere else in qmake.

Change-Id: Ifb9b2ff100837c7cf5888493a6413c972609598d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@qt.io>

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