Fix compilation warnings from Solaris Developer Studio #819

Job	Run time
Build with make	5m 3s
Build for 32-bit	27s
Build with CMake and thread-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	5m 18s
Build with CMake and address-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 21s
Build with CMake and undefined-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 12s
Run static checkers	25s
Build with CMake and leak-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 7s
Build with CMake and leak-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	5m 28s
Build with CMake and undefined-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 14s
Build with CMake [clang-20, cmake-4.0, Release]	3m 9s
Build with CMake and thread-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 32s
Build with CMake and address-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 22s
RDMA support enabled	31s
Build with CMake [gcc-9, cmake-3.13, Release]	3m 3s
Build with CMake [clang-14, cmake-3.13, Release]	3m 55s
Windows	10m 48s
Build with CMake [gcc-14, cmake-4.0, Release]	2m 57s
macOS	1m 4s
Windows (Cygwin)	2m 20s
Windows (MinGW64)	1m 9s
Installation tests	26s
CMake 3.7.0 (min. required)	24s
	1h 6m 15s

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