Fix minor coding style issues in new code in QtCore

Change-Id: I444daf8e81257f55746f9d32fbcb60a2e1b69444
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Make the use of -ffunction-sections more generic in Qt

Move it from bootstrap.pro into qt_module.prf so it will apply to any
other bootstrapped libraries, like libQmlDevTools.

Variable called "SPLIT_SECTIONS" because -fdata-sections could be added
in the future, if it proves to be a benefit.

Change-Id: I3fbb004f111620a84e58e9112e9bce3afd95631e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Make qmake also use -ffunction-sections

This might lead to a smaller binary if we use --gc-sections too.

Change-Id: I7e17b956a85ecefc3e187054848393d2855152b6
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Strip bootstrapped binaries of unused sections

This matches the -ffunction-sections from bootstrap.pro, which tells the
compiler to create a section for each function. The -gc-sections option
tells the linker to drop what wasn't used (normally, it only drops
entire files).

Before (on Linux, built with -O3, no LTO):
   text    data     bss     dec     hex filename
1746385    7920    3750 1758055  1ad367 bin/moc
1444101    6664    1894 1452659  162a73 bin/rcc
4407725    1568    4896 4414189  435aed bin/qmake

After:
   text    data     bss     dec     hex filename
1131655    6520    3494 1141669  116ba5 bin/moc
1027043    5480    1766 1034289   fc831 bin/rcc
3578489    1656    5313 3585458  36b5b2 bin/qmake

Gain: 35% on moc, 28% on rcc, 19% on qmake

Before (on OS X):
__TEXT	__DATA	__OBJC	others	dec	hex
1495040	12288	0	4294993008	4296500336	100176470	bin/moc
1265664	8192	0	4294983904	4296257760	10013b0e0	bin/rcc
5279744	81920	0	4297912320	4303273984	1007ec000	bin/qmake

After:
__TEXT	__DATA	__OBJC	others	dec	hex
806912	8192	0	4294988132	4295803236	1000cc164	bin/moc
720896	8192	0	4294979764	4295708852	1000b50b4	bin/rcc
4841472	77824	0	4295580688	4300499984	100546c10	bin/qmake

Gain: 46% on moc, 43% on rcc, 8% on qmake.

Change-Id: Icc7cdc9fd6f5db15537b4adabaac7e7a27e539d4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Skip some qsavefile auto tests

Some of the QSaveFile tests are not applicable with root privileges.

Change-Id: I1a22906c0b14acf144f1849719152dfe9d79f426
Reviewed-by: David Faure <david.faure@kdab.com>
Skip tst_QLockFile::noPermissions

QLockFile "noPermissions" test is not applicable with root
privileges.

Change-Id: I5779da524f24d0f1b9ef519d654856a6200da6bf
Reviewed-by: David Faure <david.faure@kdab.com>