remove use of install in Makefile (#56)

The current make `install` target uses `install -D` to create leading components when install into a directory.
This doesn't work on some variants of `install(1)`.

Also see Telodendria/Cytoplasm#45 and Telodendria/Cytoplasm#13 and 08166dd3a7.

---

Please review the developer certificate of origin:

1. The contribution was created in whole or in part by me, and I have
the right to submit it under the open source licenses of the
Telodendria project; or
1. The contribution is based upon a previous work that, to the best of
my knowledge, is covered under an appropriate open source license and
I have the right under that license to submit that work with
modifications, whether created in whole or in part by me, under the
Telodendria project license; or
1. The contribution was provided directly to me by some other person
who certified (1), (2), or (3), and I have not modified it.
1. I understand and agree that this project and the contribution are
made public and that a record of the contribution—including all
personal information I submit with it—is maintained indefinitely
and may be redistributed consistent with this project or the open
source licenses involved.

- [x] I have read the Telodendria Project development certificate of
origin, and I certify that I have permission to submit this patch
under the conditions specified in it.

Reviewed-on: Telodendria/Telodendria#56
Co-authored-by: LevitatingBusinessMan (Rein Fernhout) <me@levitati.ng>
Co-committed-by: LevitatingBusinessMan (Rein Fernhout) <me@levitati.ng>

configure

@@ -231,15 +231,19 @@ compile_schema() {
 install_out() {
 	src="$1"
 	out="$2"
+	dir=$(dirname "$out")
 
-	echo "${TAB}install -D \"$src\" \"$out\""
+	echo "${TAB}mkdir -p \"$dir\""
+	echo "${TAB}cp \"$src\" \"$out\""
 }
 
 install_man() {
 	src="${OUT}/man/man3/${BIN_NAME}-$(basename $1 .h).3"
 	out="$2"
+	dir=$(dirname "$out")
 
-	echo "${TAB}install -D \"$src\" \"$out\""
+	echo "${TAB}mkdir -p \"$dir\""
+	echo "${TAB}cp \"$src\" \"$out\""
 }
 
 uninstall_out() {
@@ -287,7 +291,8 @@ ${TAB}done
 ${BIN_NAME}: ${OUT}/bin/${BIN_NAME}
 
 install: ${BIN_NAME}
-${TAB}install -D ${OUT}/bin/${BIN_NAME} \$(PREFIX)/bin/${BIN_NAME}
+${TAB}mkdir -p \$(PREFIX)/bin
+${TAB}cp ${OUT}/bin/${BIN_NAME} \$(PREFIX)/bin/${BIN_NAME}
 
 uninstall:
 ${TAB}rm \$(PREFIX)/bin/${BIN_NAME}