[build] Remove install -D to support osx build

Remove -D from install.
Regular install in macOS does not have -D. This causes the bioconda
package to fail building the conda package for osx.
-d in previous line should already create the dirs if needed, so
-D is not necessary anyway.

Makefile

@@ -80,7 +80,7 @@ bindir      = $(exec_prefix)/bin
 
 INSTALL = install
 INSTALL_DIR = $(INSTALL) -dm0755
-INSTALL_PROGRAM = $(INSTALL) -Dm0755
+INSTALL_PROGRAM = $(INSTALL) -m0755
 
 #$(info CFLAGS=$(CFLAGS))
 #$(info CXXFLAGS=$(CXXFLAGS))