meson: fix building host binaries with ccache

With CONFIG_CCACHE, $HOSTCC is 'ccache gcc' while $TARGET_CC points to a
single wrapper script. Compiling target binaries with ccache works, but
doesn't for host binaries, because we need to supply an argv array for
argc > 1 in the meson cross file.

Always pass an array for the c and c++ compiler, and while at it, do it
for the target as well - just to be on the safe side if that ever
changes.

Fixes #10982.

Signed-off-by: Andre Heider <a.heider@gmail.com>
(cherry picked from commit f5c8565d1b)

devel/meson/src/openwrt-cross.txt.in

@@ -1,6 +1,6 @@
 [binaries]
-c = '@CC@'
-cpp = '@CXX@'
+c = [@CC@]
+cpp = [@CXX@]
 ar = '@AR@'
 strip = '@STRIP@'
 nm = '@NM@'

devel/meson/src/openwrt-native.txt.in

@@ -1,6 +1,6 @@
 [binaries]
-c = '@CC@'
-cpp = '@CXX@'
+c = [@CC@]
+cpp = [@CXX@]
 pkgconfig = '@PKGCONFIG@'
 
 [properties]