Foundation Classes, Message_Report - add missing mutex locks for message level

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Detailed log of new commits:

Author: Author
Date: Sat Oct 31 22:58:22 2020 +0300

    0031944: Foundation Classes - mutex for message level
    
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Branch [archived branch] has been updated forcibly by Author.

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Dear Kirill,

could you please review.
Jenkins job is: http://jenkins-test-12.nnov.opencascade.com/view/CR31944-master-nds/.

[signature removed]Natalia

No remarks to the patch, but please correct commit title to more descriptive (see updated bug title).

Branch [archived branch] has been updated forcibly by Author.

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Ready, please review again.

OCCT: CR31944
products: NONE

Combination -
OCCT branch : [archived branch]
master SHA - [revision removed]
[revision removed]
Products branch : [archived branch] SHA - [revision removed]
was compiled on Linux, MacOS and Windows platforms and tested in optimize mode.

Number of compiler warnings:
No new/fixed warnings

Regressions/Differences/Improvements:
No regressions/differences

CPU differences:
Debian80-64:
OCCT
Total CPU difference: 17709.570000000054 / 17744.450000000124 [-0.20%]
Products
Total CPU difference: 12258.480000000121 / 12330.210000000125 [-0.58%]
Windows-64-VC14:
OCCT
Total CPU difference: 19272.796875 / 19429.1875 [-0.80%]
Products
Total CPU difference: 13712.859375 / 13755.5 [-0.31%]


Image differences :
No differences that require special attention

Memory differences :
No differences that require special attention

Branch [archived branch] has been deleted by Participant.

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