[release] Update version to 1.0.0-rc1 for release

src/Makefile

 #
 # Version number calculations
 #
-VERSION_MAJOR	= 0
-VERSION_MINOR	= 9
-VERSION_PATCH	= 9
-EXTRAVERSION	= +
+VERSION_MAJOR	= 1
+VERSION_MINOR	= 0
+VERSION_PATCH	= 0
+EXTRAVERSION	= -rc1
 MM_VERSION	= $(VERSION_MAJOR).$(VERSION_MINOR)
 VERSION		= $(MM_VERSION).$(VERSION_PATCH)$(EXTRAVERSION)
 CFLAGS		+= -DVERSION_MAJOR=$(VERSION_MAJOR) \