devel/qtcreator: Update to 4.12.3

[lbartoletti]

Summary

• update to 4.12.3
• Add License

Nota: we have a problem with perfparser (it doesn't build and it doesn't understand our environmental variables. We'll look at it later).

Test Plan

poudriere (11/12 i386/amd64)
porlint (1 error [1])

[1] FATAL: Makefile: [61]: QTWEBENGINE_CMAKE_BOOL_OFF is set without USES+=cmake
But don't add cmake, otherwise qmake is no longer used.

[lbartoletti]

I opened the review too quickly. I Think we have to patch qtcreator for HEAD/clang10 as on arch: https://git.archlinux.org/svntogit/packages.git/tree/trunk/qtcreator-clang-libs.patch?h=packages/qtcreator
Work in progress

[lbartoletti]

In D25384#560017, @lbartoletti wrote:

I opened the review too quickly.

Grumpff It has been built second time without changes -- maybe a problem with my poudriere (not in a clean state?) So OK on HEAD i386/amd64

I Think we have to patch qtcreator for HEAD/clang10 as on arch: https://git.archlinux.org/svntogit/packages.git/tree/trunk/qtcreator-clang-libs.patch?h=packages/qtcreator
Work in progress

[lbartoletti]

Add patch for LLVM10 inspired from https://git.archlinux.org/svntogit/packages.git/tree/trunk/qtcreator-clang-libs.patch?h=packages/qtcreator

This patch breaks the build with llvm80. Therefore, it should only be used with LLVM10. For information, it is not necessary to build with LLVM10. Dunno, if it's worth adding it and if it brings a LLVM option forgotten by the QtCreator developers and added by arch devs.

[tcberner]

devel/qtcreator/files/llvm10_patch-src_shared_clang_clang__installation.pri

1 ↗

(On Diff #73470)

^ could you add the origin of the patch at the top:

Obtained from:  https://...

--- src/...
+++ src/...
[...]

[lbartoletti]

Add mention "Obtained from: "

[tcberner]