msvcp90: Added basic_string<char>::npos.

dlls/msvcp90/msvcp90.spec

@@ -4589,7 +4589,7 @@
 @ cdecl -arch=win64 ?not_eof@?$char_traits@G@std@@SAGAEBG@Z(ptr) MSVCP_char_traits_short_not_eof
 @ cdecl -arch=win32 ?not_eof@?$char_traits@_W@std@@SAGABG@Z(ptr) MSVCP_char_traits_wchar_not_eof
 @ cdecl -arch=win64 ?not_eof@?$char_traits@_W@std@@SAGAEBG@Z(ptr) MSVCP_char_traits_wchar_not_eof
-@ stub -arch=win32 ?npos@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@2IB
+@ extern -arch=win32 ?npos@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@2IB MSVCP_basic_string_char_npos
 @ stub -arch=win64 ?npos@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@2_KB
 @ stub -arch=win32 ?npos@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@2IB
 @ stub -arch=win64 ?npos@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@2_KB

dlls/msvcp90/string.c

@@ -467,6 +467,9 @@ unsigned short CDECL MSVCP_char_traits_short_not_eof(const unsigned short *in)
 
 
 /* basic_string<char, char_traits<char>, allocator<char>> */
+/* ?npos@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@2IB */
+const size_t MSVCP_basic_string_char_npos = -1;
+
 /* Internal: basic_string_char_ptr - return pointer to stored string */
 static char* basic_string_char_ptr(basic_string_char *this)
 {