fix: workaround for os module using wrong path separator when cross compiling

Author: richard-ramos

boringssl.nim

@@ -204,7 +204,8 @@ when BORINGSS_USE_ASM:
 
     static:
       for asmPathRel in asmFiles:
-        let asmPath = baseDir / asmPathRel
+        var asmPath = baseDir / asmPathRel
+        asmPath.normalizePath(dirSep = '/')
         let outObj = outDir / (asmPath.splitFile.name & ".obj")
         let hashPath = outObj & ".md5"
         let srcHash = getMD5(staticRead(asmPath))