crt: Mark internal mingw-w64 function _ValidateImageBase as static

This function is used only in the pesect.c file.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-crt/crt/pesect.c

diff --git a/mingw-w64-crt/crt/pesect.c b/mingw-w64-crt/crt/pesect.c
index 85b2213..84326af 100644
--- a/mingw-w64-crt/crt/pesect.c
+++ b/mingw-w64-crt/crt/pesect.c
@@ -8,9 +8,7 @@
 
 extern IMAGE_DOS_HEADER __ImageBase;
 
-WINBOOL _ValidateImageBase (PBYTE);
-
-WINBOOL
+static WINBOOL
 _ValidateImageBase (PBYTE pImageBase)
 {
   PIMAGE_DOS_HEADER pDOSHeader;

mingw-w64-crt/include/internal.h

diff --git a/mingw-w64-crt/include/internal.h b/mingw-w64-crt/include/internal.h
index ab75000..833b48a 100644
--- a/mingw-w64-crt/include/internal.h
+++ b/mingw-w64-crt/include/internal.h
@@ -141,8 +141,6 @@
 #include <crtdbg.h>
 #include <errno.h>
 
-  BOOL __cdecl _ValidateImageBase (PBYTE pImageBase);
-
 #if defined(__SSE__)
 # define __mingw_has_sse()  1
 #elif defined(__i386__)