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libdraw: add a prototype for invm(2) to mkwarp.c

--- a/libdraw/mkwarp.c

+++ b/libdraw/mkwarp.c

@@ -4,6 +4,8 @@

 typedef double Matrix[3][3];

+void invm(Matrix);

+

 /* 25.7 fixed-point number operations */

 #define flt2fix(n)	((long)((n)*(1<<7) + ((n) < 0? -0.5: 0.5)))

-- 

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