msvc: Move linker pragma from config.h to libavutil/internal.h

This makes linking succeed for tools that include config.h but
don't link to libavutil.
Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -4089,11 +4089,6 @@ fi
 
 enabled getenv || echo "#define getenv(x) NULL" >> $TMPH
 
-if enabled msvc && ! enabled shared; then
-    echo '#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")' >> $TMPH
-    echo '#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")' >> $TMPH
-fi
-
 print_config ARCH_   "$config_files" $ARCH_LIST
 print_config HAVE_   "$config_files" $HAVE_LIST
 print_config CONFIG_ "$config_files" $CONFIG_LIST       \

libavutil/internal.h

@@ -111,6 +111,11 @@
 
 #include "libm.h"
 
+#if defined(_MSC_VER) && !CONFIG_SHARED
+#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
+#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
+#endif
+
 /**
  * Return NULL if CONFIG_SMALL is true, otherwise the argument
  * without modification. Used to disable the definition of strings