kbuild: pacman-pkg: hardcode module installation path

'make pacman-pkg' for architectures with device tree support (i.e., arm,
arm64, etc.) shows logs like follows:

  Installing dtbs...
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr//lib/modules/6.14.0-rc6+/dtb/actions/s700-cubieboard7.dtb
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr//lib/modules/6.14.0-rc6+/dtb/actions/s900-bubblegum-96.dtb
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr//lib/modules/6.14.0-rc6+/dtb/airoha/en7581-evb.dtb
      ...

The double slashes ('//') between 'usr' and 'lib' are somewhat ugly.

Let's hardcode the module installation path because the package contents
should remain unaffected even if ${MODLIB} is overridden. Please note that
scripts/packages/{builddeb,kernel.spec} also hardcode the module
installation path.

With this change, the log will look better, as follows:

  Installing dtbs...
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr/lib/modules/6.14.0-rc6+/dtb/actions/s700-cubieboard7.dtb
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr/lib/modules/6.14.0-rc6+/dtb/actions/s900-bubblegum-96.dtb
    INSTALL /home/masahiro/linux/pacman/linux-upstream/pkg/linux-upstream/usr/lib/modules/6.14.0-rc6+/dtb/airoha/en7581-evb.dtb
      ...

Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Thomas Weißschuh <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>

Author: masahir0y

scripts/package/PKGBUILD

@@ -53,7 +53,7 @@ build() {
 _package() {
 	pkgdesc="The ${pkgdesc} kernel and modules"
 
-	local modulesdir="${pkgdir}/usr/${MODLIB}"
+	local modulesdir="${pkgdir}/usr/lib/modules/${KERNELRELEASE}"
 
 	_prologue
 
@@ -81,7 +81,7 @@ _package() {
 _package-headers() {
 	pkgdesc="Headers and scripts for building modules for the ${pkgdesc} kernel"
 
-	local builddir="${pkgdir}/usr/${MODLIB}/build"
+	local builddir="${pkgdir}/usr/lib/modules/${KERNELRELEASE}/build"
 
 	_prologue
 
@@ -114,7 +114,7 @@ _package-debug(){
 	pkgdesc="Non-stripped vmlinux file for the ${pkgdesc} kernel"
 
 	local debugdir="${pkgdir}/usr/src/debug/${pkgbase}"
-	local builddir="${pkgdir}/usr/${MODLIB}/build"
+	local builddir="${pkgdir}/usr/lib/modules/${KERNELRELEASE}/build"
 
 	_prologue