Fix GCC 15 compatibility issues

1. Fix buffer overflow in SvMemoryStream::PutData: add bounds check
before memcpy to prevent overflow when buffer reallocation fails.

2. Change RTLD_NOW to RTLD_L

Fix GCC 15 compatibility issues

1. Fix buffer overflow in SvMemoryStream::PutData: add bounds check
before memcpy to prevent overflow when buffer reallocation fails.

2. Change RTLD_NOW to RTLD_LAZY in checkdll: GCC 15 with
_FORTIFY_SOURCE=2 detects issues with eager symbol resolution
in shared libraries with many undefined symbols.

Source-only fixes; no Makefile changes.

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Fix GCC 15 C++ standard library conflict with _CR/_LF macros

GCC 15's C++ standard library headers (bits/chrono.h) use _CR as an
internal template parameter name. The _CR and _LF macros defined in
t

Fix GCC 15 C++ standard library conflict with _CR/_LF macros

GCC 15's C++ standard library headers (bits/chrono.h) use _CR as an
internal template parameter name. The _CR and _LF macros defined in
tools/solar.h conflict with these internal identifiers, causing
compilation failures in headers that include both solar.h and C++
standard headers.

Rename _CR->_LF to SAL_CR->SAL_LF across the codebase to avoid
conflicts with reserved identifiers in the C++ standard library.

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