upgrading to TBB version 2020.3; adding unmodified TBB library

lib/tbb_2020.3/.gitattributes

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+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.c text
+*.h text
+*.cpp text
+*.def text
+*.rc text
+*.i text
+*.sh text
+*.csh text
+*.mk text
+*.java text
+*.csv text
+*.lst text
+*.asm text
+*.cfg text
+*.css text
+*.inc text
+*.js text
+*.rb text
+*.strings text
+*.txt text
+*export.lst text
+*.xml text
+*.py text
+*.md text
+*.classpath text
+*.cproject text
+*.project text
+*.properties text
+*.java text
+*.gradle text
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln text eol=crlf
+*.bat text eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+*.ico binary
+*.spir binary

lib/tbb_2020.3/.gitignore

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+# Ignore the debug and release directories created with Makefile builds #
+#########################################################################
+build/*_debug/
+build/*_release/
+
+# Compiled source #
+###################
+*.com
+*.class
+*.dll
+*.lib
+*.pdb
+*.exe
+*.o
+*.so
+*.so.1
+*.so.2
+*.dylib
+*.a
+*.obj
+*.pyc
+
+*.orig
+*.raw
+*.sample
+*.slo
+*.swp
+*.config
+*.la
+*.lai
+*.lo
+*.nhdr
+*.nii.gz
+*.nrrd
+
+# Packages #
+############
+# it's better to unpack these files and commit the raw source
+# git has its own built in compression methods
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.tgz
+*.zip
+
+# Logs and databases #
+######################
+*.log
+*.sql
+*.sqlite
+
+# OS generated files #
+######################
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# IDE generated files #
+######################
+/.ninja_deps
+/.ninja_log
+/build.ninja
+/rules.ninja
+*~
+.emacs.desktop
+.tags
+
+# Build system generated files #
+################################
+CMakeCache.txt
+CMakeFiles/
+cmake/TBBConfig.cmake
+cmake/TBBConfigVersion.cmake
+
+# Other #
+#########
+.clang_complete
+.idea
+.svn
+crash*
+*.tmp
+/.vs