Multiarch Fixes - gmt-gshhg

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Diff

diff --git a/debian/control b/debian/control
index fdcd730..0851771 100644
--- a/debian/control
+++ b/debian/control
@@ -16,6 +16,7 @@ Depends: gmt-gshhg-low,
          gmt-gshhg-high,
          gmt-gshhg-full,
          ${misc:Depends}
+Multi-Arch: foreign
 Description: Global Self-consistent Hierarchical High-resolution Geography (GSHHG)
  GSHHG is a high-resolution shoreline data set amalgamated from two databases:
  Global Self-consistent Hierarchical High-resolution Shorelines (GSHHS) and

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