Squashed 'src/secp256k1/' changes from 2bfb82b..6c527ec

6c527ec Merge pull request dogecoin#357
445f7f1 Fix for Windows compile issue

git-subtree-dir: src/secp256k1
git-subtree-split: 6c527eceee7f5105c33c98dfae24ffeffd71f7cf

Author: MarcoFalke

Makefile.am

@@ -75,7 +75,7 @@ TESTS = tests
 endif
 
 if USE_ECMULT_STATIC_PRECOMPUTATION
-CPPFLAGS_FOR_BUILD +=-I$(top_srcdir)/
+CPPFLAGS_FOR_BUILD +=-I$(top_srcdir)
 CFLAGS_FOR_BUILD += -Wall -Wextra -Wno-unused-function
 
 gen_context_OBJECTS = gen_context.o