system/physmem: Remove _WIN32 #ifdef'ry

Commit fb3ecb7ea4 ("exec: Exclude non portable function for
MinGW") guarded cpu_physical_memory_set_dirty_lebitmap() within
_WIN32 #ifdef'ry because of the non-portable ffsl() call, which
was later replaced for the same reason by commit 7224f66ec3
("exec: replace ffsl with ctzl"); we don't need that anymore.

Reported-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20251001175448.18933-13-philmd@linaro.org>

include/system/ram_addr.h

@@ -155,8 +155,6 @@ void cpu_physical_memory_set_dirty_flag(ram_addr_t addr, unsigned client);
 void cpu_physical_memory_set_dirty_range(ram_addr_t start, ram_addr_t length,
                                          uint8_t mask);
 
-#if !defined(_WIN32)
-
 /*
  * Contrary to cpu_physical_memory_sync_dirty_bitmap() this function returns
  * the number of dirty pages in @bitmap passed as argument. On the other hand,
@@ -265,7 +263,6 @@ uint64_t cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
 
     return num_dirty;
 }
-#endif /* not _WIN32 */
 
 static inline void cpu_physical_memory_dirty_bits_cleared(ram_addr_t start,
                                                           ram_addr_t length)