crt: Add double underscore prefix to internal symbols used for linking in init routines

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-crt/crt/charmax.c

diff --git a/mingw-w64-crt/crt/charmax.c b/mingw-w64-crt/crt/charmax.c
index 08aa5a1..5106d1e 100644
--- a/mingw-w64-crt/crt/charmax.c
+++ b/mingw-w64-crt/crt/charmax.c
@@ -10,7 +10,7 @@
 
 __declspec(dllimport) int __lconv_init (void);
 
-int mingw_initcharmax = 0;
+int __mingw_initcharmax = 0;
 
 int _charmax = 255;
 

mingw-w64-crt/crt/crtexe.c

diff --git a/mingw-w64-crt/crt/crtexe.c b/mingw-w64-crt/crt/crtexe.c
index 4c7830f..a7af136 100644
--- a/mingw-w64-crt/crt/crtexe.c
+++ b/mingw-w64-crt/crt/crtexe.c
@@ -329,9 +329,9 @@
   return mainret;
 }
 
-extern int mingw_initltsdrot_force;
-extern int mingw_initltsdyn_force;
-extern int mingw_initltssuo_force;
+extern int __mingw_initltsdrot_force;
+extern int __mingw_initltsdyn_force;
+extern int __mingw_initltssuo_force;
 
 static int __cdecl
 check_managed_app (void)
@@ -342,9 +342,9 @@
   PIMAGE_OPTIONAL_HEADER64 pNTHeader64;
 
   /* Force to be linked.  */
-  mingw_initltsdrot_force=1;
-  mingw_initltsdyn_force=1;
-  mingw_initltssuo_force=1;
+  __mingw_initltsdrot_force=1;
+  __mingw_initltsdyn_force=1;
+  __mingw_initltssuo_force=1;
 
   pDOSHeader = (PIMAGE_DOS_HEADER) &__ImageBase;
   if (pDOSHeader->e_magic != IMAGE_DOS_SIGNATURE)

mingw-w64-crt/crt/tlssup.c

diff --git a/mingw-w64-crt/crt/tlssup.c b/mingw-w64-crt/crt/tlssup.c
index 582fa85..47beb27 100644
--- a/mingw-w64-crt/crt/tlssup.c
+++ b/mingw-w64-crt/crt/tlssup.c
@@ -170,6 +170,6 @@
 _CRTALLOC(".CRT$XLD") PIMAGE_TLS_CALLBACK __xl_d = (PIMAGE_TLS_CALLBACK) __dyn_tls_dtor;
 
 
-int mingw_initltsdrot_force = 0;
-int mingw_initltsdyn_force = 0;
-int mingw_initltssuo_force = 0;
+int __mingw_initltsdrot_force = 0;
+int __mingw_initltsdyn_force = 0;
+int __mingw_initltssuo_force = 0;