Fix compilation warnings from Solaris Developer Studio #825

Job	Run time
Run static checkers	29s
Solaris (threads=0, tls=0)	2m 0s
RDMA support enabled	22s
macOS	48s
Solaris (threads=1, tls=1)	2m 37s
Windows	10m 36s
Windows (Cygwin)	2m 37s
Windows (MinGW64)	1m 14s
Build with make	5m 0s
Solaris (threads=1, tls=0)	2m 28s
Solaris (threads=0, tls=1)	2m 25s
Build for 32-bit	33s
Installation tests	35s
Build with CMake and undefined-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 6s
Build with CMake and address-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 34s
Build with CMake and thread-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	5m 26s
Build with CMake and leak-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 21s
Build with CMake and undefined-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 24s
CMake 3.7.0 (min. required)	15s
Build with CMake and thread-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	5m 25s
Build with CMake [gcc-14, cmake-4.0, Release]	3m 7s
Build with CMake and address-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 40s
Build with CMake and leak-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	5m 27s
Build with CMake [clang-20, cmake-4.0, Release]	3m 23s
Build with CMake [gcc-9, cmake-3.13, Release]	3m 7s
Build with CMake [clang-14, cmake-3.13, Release]	3m 50s
	1h 18m 49s

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