scripts, cc/gcc: do not fail on existing symlinks or build.log
If the user builds a toolchain over an existing one, so, without removing
CT_PREFIX_DIR, the build fails as the symlinks already exist, as does the
build.log.
This can also happen (for build.log) if the user first ran in download-
or extract-only.
Patch (with no SoB) originally from:
Phil Wilshire <phil.wilshire@overturenetworks.com>
Modified by me as it did not apply cleanly.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 1ebc2248cc60230cd53ff94ae8f8f1e3261461a3)
1 Original patch from gentoo: ../../dev/crosstool-NG/ct-ng.trunk/patches/strace/4.5.17/150-undef-CTL_PROC.patch
2 -= BEGIN original header =-
3 diff -dur strace-4.5.16.orig/system.c strace-4.5.16/system.c
4 -= END original header =-
5 diff -durN strace-4.5.17.orig/system.c strace-4.5.17/system.c
6 --- strace-4.5.17.orig/system.c 2007-01-17 00:22:36.000000000 +0100
7 +++ strace-4.5.17/system.c 2008-10-24 21:30:13.000000000 +0200
9 { CTL_KERN, "CTL_KERN" },
11 { CTL_NET, "CTL_NET" },
13 { CTL_PROC, "CTL_PROC" },
16 { CTL_DEBUG, "CTL_DEBUG" },
17 { CTL_DEV, "CTL_DEV" },