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

Author: richard-ramos

boringssl.nim

@@ -207,7 +207,7 @@ when BORINGSS_USE_ASM:
         let asmPath = baseDir / asmPathRel
         let outObj = outDir / (asmPath.splitFile.name & ".obj")
         let hashPath = outObj & ".md5"
-        let srcHash = getMD5(staticRead(asmPath))
+        let srcHash = getMD5(staticRead(asmPath).normalizePath(dirSep = '/'))
         let cachedHash =
           if fileExists(hashPath):
             readFile(hashPath)