Makefile: Set htmldir to match the default HTML docs location under MSYS

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

config.mak.uname

@@ -615,7 +615,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 	NATIVE_CRLF = YesPlease
 	X = .exe
 ifneq (,$(wildcard ../THIS_IS_MSYSGIT))
-	htmldir = doc/git/html/
+	htmldir = share/doc/git/$(firstword $(subst -, ,$(GIT_VERSION)))/html
 	prefix =
 	INSTALL = /bin/install
 	EXTLIBS += /mingw/lib/libz.a