build: Replace build_linux32 with env vars

This is much distro-agnostic.

(Only sane distros [Arch] use /usr/lib32 and not /usr/lib/i386-linux-gnu)

Signed-off-by: Joshua Ashton <joshua@froggi.es>

README.md

@@ -55,11 +55,13 @@ ninja install
 ```
 # 64-bit build.
 meson --cross-file build-win64.txt --buildtype release --prefix /your/vkd3d-proton/directory build.64
+
 cd build.64
 ninja install
 
 # 32-bit build
 meson --cross-file build-win32.txt --buildtype release --prefix /your/vkd3d-proton/directory build.86
+
 cd build.86
 ninja install
 ```
@@ -68,11 +70,15 @@ ninja install
 ```
 # 64-bit build.
 meson --buildtype release --prefix /your/vkd3d-proton/directory build.64
+
 cd build.64
 ninja install
 
 # 32-bit build
-meson --cross-file x86-linux-gnu --buildtype release --prefix /your/vkd3d-proton/directory build.86
+CC="gcc -m32" CXX="g++ -m32" \
+PKG_CONFIG_PATH="/usr/lib32/pkgconfig:/usr/lib/i386-linux-gnu/pkgconfig:/usr/lib/pkgconfig" \
+meson --buildtype release --prefix /your/vkd3d-proton/directory build.86
+
 cd build.86
 ninja install
 ```

build-linux32.txt

@@ -1,24 +0,0 @@
-[binaries]
-c = 'gcc'
-cpp = 'g++'
-ar = 'gcc-ar'
-strip = 'strip'
-
-[properties]
-c_args = ['-m32']
-c_link_args = ['-m32']
-cpp_args = ['-m32']
-cpp_link_args = ['-m32']
-pkg_config_path = ['/usr/lib32/pkgconfig']
-pkg_config_libdir = ['/usr/lib32/pkgconfig']
-
-[paths]
-prefix = '/usr'
-libdir = 'lib32'
-bindir = 'bin'
-
-[host_machine]
-system = 'linux'
-cpu_family = 'x86'
-cpu = 'i686'
-endian = 'little'

package-release.sh

@@ -89,7 +89,7 @@ if [ $opt_native -eq 0 ]; then
   build_script
 else
   build_arch 64
-  build_arch 86 --cross-file build-linux32.txt
+  CC="gcc -m32" CXX="g++ -m32" PKG_CONFIG_PATH="/usr/lib32/pkgconfig:/usr/lib/i386-linux-gnu/pkgconfig:/usr/lib/pkgconfig" build_arch 86
 fi
 
 if [ $opt_nopackage -eq 0 ]; then