fix: fortran benchmark build

Author: DhruvArvindSingh

lib/node_modules/@stdlib/blas/base/dger/benchmark/fortran/Makefile

@@ -78,7 +78,7 @@ endif
 INCLUDE ?=
 
 # List of Fortran source files:
-SOURCE_FILES ?= ../../src/dger.f
+SOURCE_FILES ?= ../../src/dger.f ../../../xerbla/src/xerbla.f
 
 # List of Fortran targets:
 f_targets := benchmark.length.out