build: add support for OpenBSD to depends

depends/hosts/openbsd.mk

@@ -0,0 +1,31 @@
+openbsd_CFLAGS=-pipe
+openbsd_CFLAGS_CXXFLAGS=$(openbsd_CFLAGS)
+
+openbsd_CFLAGS_release_CFLAGS=-O2
+openbsd_CFLAGS_release_CXXFLAGS=$(openbsd_release_CFLAGS)
+
+openbsd_CFLAGS_debug_CFLAGS=-O1
+openbsd_CFLAGS_debug_CXXFLAGS=$(openbsd_debug_CFLAGS)
+
+ifeq (86,$(findstring 86,$(build_arch)))
+i686_openbsd_CC=clang -m32
+i686_openbsd_CXX=clang++ -m32
+i686_openbsd_AR=ar
+i686_openbsd_RANLIB=ranlib
+i686_openbsd_NM=nm
+i686_openbsd_STRIP=strip
+
+x86_64_openbsd_CC=clang -m64
+x86_64_openbsd_CXX=clang++ -m64
+x86_64_openbsd_AR=ar
+x86_64_openbsd_RANLIB=ranlib
+x86_64_openbsd_NM=nm
+x86_64_openbsd_STRIP=strip
+else
+i686_openbsd_CC=$(default_host_CC) -m32
+i686_openbsd_CXX=$(default_host_CXX) -m32
+x86_64_openbsd_CC=$(default_host_CC) -m64
+x86_64_openbsd_CXX=$(default_host_CXX) -m64
+endif
+
+openbsd_cmake_system=OpenBSD