Fixes #432, bug in using openmp with gcc and omp_get_num_threads() #1303

Job	Run time
Unit tests / Unit Tests (ubuntu-latest)	4m 41s
Unit tests / Unit Tests (windows-2019)	11m 8s
Unit tests / Unit Tests (windows-latest)	12m 26s
Dynamic / Dynamic (ubuntu-latest)	5m 4s
Dynamic / Dynamic (windows-2019)	13m 22s
Dynamic / Dynamic (windows-latest)	11m 49s
Disk with PQ / Disk, PQ (ubuntu-latest)	8m 8s
Disk with PQ / Disk, PQ (windows-2019)	12m 0s
Disk with PQ / Disk, PQ (windows-latest)	15m 51s
In-Memory with PQ / In-Mem, PQ (ubuntu-latest)	4m 49s
In-Memory with PQ / In-Mem, PQ (windows-2019)	11m 3s
In-Memory with PQ / In-Mem, PQ (windows-latest)	11m 30s
In-Memory without PQ / In-Mem, Without PQ (ubuntu-latest)	6m 5s
In-Memory without PQ / In-Mem, Without PQ (windows-2019)	12m 35s
In-Memory without PQ / In-Mem, Without PQ (windows-latest)	9m 10s
Labels / Labels (ubuntu-latest)	9m 23s
Labels / Labels (windows-2019)	13m 3s
Labels / Labels (windows-latest)	15m 20s
Multi-sector Disk with PQ / Disk, PQ (ubuntu-latest)	8m 13s
Multi-sector Disk with PQ / Disk, PQ (windows-2019)	18m 5s
Multi-sector Disk with PQ / Disk, PQ (windows-latest)	15m 19s
Python / Python - Ubuntu - cp39-manylinux_x86_64	11m 5s
Python / Python - Ubuntu - cp310-manylinux_x86_64	13m 28s
Python / Python - Ubuntu - cp311-manylinux_x86_64	13m 11s
Python / Python - Windows - cp39-win_amd64	12m 53s
Python / Python - Windows - cp310-win_amd64	12m 35s
Python / Python - Windows - cp311-win_amd64	12m 40s
DiskANN Common Build Checks / Code Formatting Test	13s
DiskANN Common Build Checks / Docker Container Build	5m 58s
	5h 11m 7s

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