Global: fixes -ffast-math compatibility

Unifies unset double handling using `-DBL_MAX` sentinel

Fixes #1894

src/detection/gpu/gpu.h

@@ -3,11 +3,11 @@
 #include "fastfetch.h"
 #include "modules/gpu/option.h"
 
-#define FF_GPU_TEMP_UNSET (0/0.0)
+#define FF_GPU_TEMP_UNSET (-DBL_MAX)
 #define FF_GPU_CORE_COUNT_UNSET -1
 #define FF_GPU_VMEM_SIZE_UNSET ((uint64_t)-1)
 #define FF_GPU_FREQUENCY_UNSET 0
-#define FF_GPU_CORE_USAGE_UNSET (0/0.0)
+#define FF_GPU_CORE_USAGE_UNSET (-DBL_MAX)
 #define FF_GPU_INDEX_UNSET ((uint32_t)-1)
 
 extern const char* FF_GPU_VENDOR_NAME_APPLE;

src/detection/gpu/gpu_windows.c

@@ -411,7 +411,7 @@ const char* ffDetectGPUImpl(FF_MAYBE_UNUSED const FFGPUOptions* options, FFlist*
                         FF_DEBUG("Failed to open adapter from LUID");
                     }
 
-                    if (options->temp && gpu->temperature != gpu->temperature)
+                    if (options->temp && gpu->temperature == FF_GPU_TEMP_UNSET)
                     {
                         FF_DEBUG("Trying to get GPU temperature");
                         D3DKMT_QUERYSTATISTICS queryStatistics = {