[flang] [llvm] [flang] Implement external routine usage of hostnm() (PR #134900)

[Eugene Epshteyn via llvm-commits]

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@@ -264,6 +264,43 @@ int RTNAME(Chdir)(const char *name) {
 #endif
 }
 
+int FORTRAN_PROCEDURE_NAME(hostnm)(char *hn, int length) {
+
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eugeneepshteyn wrote:

Removed some blank lines. 

https://github.com/llvm/llvm-project/pull/134900