winegcc: Also check magic number to detect shared libraries.

tools/winegcc/utils.c

@@ -212,6 +212,7 @@ file_type get_file_type(const char* filename)
 {
     /* see tools/winebuild/res32.c: check_header for details */
     static const char res_sig[] = { 0,0,0,0, 32,0,0,0, 0xff,0xff, 0,0, 0xff,0xff, 0,0, 0,0,0,0, 0,0, 0,0, 0,0,0,0, 0,0,0,0 };
+    static const char elf_sig[4] = "\177ELF";
     char buf[sizeof(res_sig)];
     int fd, cnt;
 
@@ -230,6 +231,11 @@ file_type get_file_type(const char* filename)
     if (strendswith(filename, ".def")) return file_def;
     if (strendswith(filename, ".spec")) return file_spec;
     if (strendswith(filename, ".rc")) return file_rc;
+    if (cnt >= sizeof(elf_sig) && !memcmp(buf, elf_sig, sizeof(elf_sig))) return file_so;  /* ELF lib */
+    if (cnt >= sizeof(unsigned int) &&
+        (*(unsigned int *)buf == 0xfeedface || *(unsigned int *)buf == 0xcefaedfe ||
+         *(unsigned int *)buf == 0xfeedfacf || *(unsigned int *)buf == 0xcffaedfe))
+        return file_so; /* Mach-O lib */
 
     return file_other;
 }