3rdparty: Fix Makefile coding conventions
diff --git a/3rdparty/everest/Makefile.inc b/3rdparty/everest/Makefile.inc
old mode 100755
new mode 100644
index 0b71e2a..7ca70ec
--- a/3rdparty/everest/Makefile.inc
+++ b/3rdparty/everest/Makefile.inc
@@ -16,3 +16,4 @@
 	../3rdparty/everest/library/kremlib/FStar_UInt128_extracted.o
 endif
 endif
+