Fix compilation warnings from Solaris Developer Studio #834

Job	Run time
Build for 32-bit	36s
Build with make	5m 24s
Installation tests	27s
CMake 3.7.0 (min. required)	27s
RDMA support enabled	25s
Run static checkers	25s
Build with CMake and undefined-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 48s
Build with CMake and address-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 23s
Build with CMake and leak-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	2m 59s
Build with CMake and undefined-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 16s
Build with CMake and address-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 32s
Build with CMake and thread-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	5m 27s
Build with CMake and leak-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	5m 35s
Build with CMake [clang-20, cmake-4.0, Release]	3m 11s
Build with CMake and thread-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 38s
Build with CMake [gcc-14, cmake-4.0, Release]	2m 56s
Build with CMake [gcc-9, cmake-3.13, Release]	3m 4s
Windows	10m 49s
macOS	53s
Windows (MinGW64)	1m 12s
Build with CMake [clang-14, cmake-3.13, Release]	3m 44s
Windows (Cygwin)	3m 8s
	1h 8m 19s

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