Linux: ensure GLib's g_print*() functions wrap the system ones (#264)

C99 `printf()` semantics are well-supported by these Linux
cross-targets, avoids the need for gnulib compat functions.

An alternative is setting up QEMU when cross-compiling, as this
functionality is gated by `meson.can_run_host_binaries()`, but
this is a bit simpler.

Author: kleisauke

platforms/linux-armv6/meson.ini

@@ -13,6 +13,12 @@ ld = 'arm-rpi-linux-gnueabihf-gcc-ld'
 strip = 'arm-rpi-linux-gnueabihf-strip'
 ranlib = 'arm-rpi-linux-gnueabihf-gcc-ranlib'
 
+[properties]
+# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
+have_c99_vsnprintf = true
+have_c99_snprintf = true
+have_unix98_printf = true
+
 [built-in options]
 libdir = 'lib'
 datadir = '/usr/share'

platforms/linux-ppc64le/meson.ini

@@ -14,6 +14,12 @@ strip = 'powerpc64le-linux-gnu-strip'
 ranlib = 'powerpc64le-linux-gnu-gcc-ranlib'
 #exe_wrapper = 'qemu-ppc64le-static'
 
+[properties]
+# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
+have_c99_vsnprintf = true
+have_c99_snprintf = true
+have_unix98_printf = true
+
 [built-in options]
 libdir = 'lib'
 datadir = '/usr/share'

platforms/linux-s390x/meson.ini

@@ -14,6 +14,12 @@ strip = 's390x-linux-gnu-strip'
 ranlib = 's390x-linux-gnu-gcc-ranlib'
 #exe_wrapper = 'qemu-s390x-static'
 
+[properties]
+# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
+have_c99_vsnprintf = true
+have_c99_snprintf = true
+have_unix98_printf = true
+
 [built-in options]
 libdir = 'lib'
 datadir = '/usr/share'

platforms/linuxmusl-arm64v8/meson.ini

@@ -13,10 +13,14 @@ ld = 'aarch64-linux-musl-ld'
 strip = 'aarch64-linux-musl-strip'
 ranlib = 'aarch64-linux-musl-ranlib'
 
+[properties]
 # Ensure we disable the inotify backend in GIO
 # See: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2991#note_1592863
-[properties]
 has_function_inotify_init1 = false
+# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
+have_c99_vsnprintf = true
+have_c99_snprintf = true
+have_unix98_printf = true
 
 [built-in options]
 libdir = 'lib'

platforms/linuxmusl-x64/meson.ini

@@ -1,9 +1,9 @@
 [binaries]
 strip = 'strip'
 
+[properties]
 # Ensure we disable the inotify backend in GIO
 # See: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2991#note_1592863
-[properties]
 has_function_inotify_init1 = false
 
 [built-in options]