Removed executable bits on patch file

Change-Id: If4bed7d12570ff126bec8638480430796f0e89f8
Reviewed-on: https://gerrit.libreoffice.org/81462
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
diff --git a/external/glm/c++20.patch.0 b/external/glm/c++20.patch.0
old mode 100755
new mode 100644