added xorg.conf: explicitly declares to not use glamor, which was causing slowdown

aports/device/device-nokia-n900/APKBUILD

@@ -1,6 +1,6 @@
 pkgname=device-nokia-n900
 pkgver=2
-pkgrel=8
+pkgrel=9
 pkgdesc="Nokia N900"
 url="https://postmarketos.org"
 arch="noarch"
@@ -31,6 +31,7 @@ source="
 	i3wm/i3wm.conf
 	i3wm/i3status.conf
 	i3wm/bq27200_status.sh
+	xorg.conf
 "
 options="!check"
 
@@ -86,6 +87,8 @@ x11() {
 	install_if="$pkgname xorg-server"
 	install -D -m644 "$srcdir"/40-xkb.conf \
 		"$subpkgdir"/etc/X11/xorg.conf.d/40-xkb.conf
+	install -D -m644 "$srcdir"/xorg.conf \
+		"$subpkgdir"/etc/X11/xorg.conf.d/11-n900.conf
 }
 
 i3wm() {
@@ -119,4 +122,5 @@ e023df91295fe7e410e163747d17e5b92fe3c022ff076e286778b8334368f885603b8fda65671e4a
 7f48d1a044f8c02f7b1d11487ec1f83978d9b0ea12529156e7418f82be556d9baee32b70c4d911174e388bb4941dc19519e93e7551d00ffcd825c848665ff096  weston.ini
 387c76ef51d08b1f397364657ab32c5915fbd62b2786e9fd61b47e9eeed36d24571e22974ea36cb1b01c25eef5789c4e8e1de9a23de3a4a9192e727ed6a7ab67  i3wm.conf
 3bed8554400d6bbebf7e61b14f347a0f3e24b29be296c56fc829ed655cf67fa547c09bb715589b716d6c3f04492e9f3a12473dce6c7151bc15562b9d102bac2f  i3status.conf
-4e7abd1ac6223494b2ce96f7fb2dfe6116ee8a526440df07307994ed577f1860222548f7512273b5a21febac8119794774658f60e5d6976747ddc60323d26a62  bq27200_status.sh"
+4e7abd1ac6223494b2ce96f7fb2dfe6116ee8a526440df07307994ed577f1860222548f7512273b5a21febac8119794774658f60e5d6976747ddc60323d26a62  bq27200_status.sh
+a91f98daa60efa2beb2ff6b405097f92edca5f1bbb9e7675499139be52ca2570712f8f06f9032ef29f636f99c8f8da8b992f746eab6424aac04260c16158bcc2  xorg.conf"

aports/device/device-nokia-n900/xorg.conf

@@ -0,0 +1,6 @@
+Section "OutputClass"
+	Identifier "LCD"
+        MatchDriver "omapdrm"
+        Driver "modesetting"
+        Option "AccelMethod" "none"
+EndSection