ghostscript: Do not treat declaration-after-statement warning as error

This option is added by ghostscript and is passed down to its modules
e.g. brotli, brotli does expect c99 or newer standard and hence uses
declarations after statement. This option causes compiler e.g. clang
to find this warning and treat it as error on 32bit builds

./brotli/c/dec/decode.c:440:12: error: mixing declarations and code is incompatible with standards before C99 [-Werror,-Wdeclaration-after-statement]
  440 |   uint32_t __fastload_table = (*table);
      |            ^
1 error generated.

(From OE-Core rev: 9b8e0b9a30f1de8bd1816f2528bc696f769dd8dc)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ghostscript/ghostscript_10.06.0.bb

@@ -47,7 +47,7 @@ EXTRA_OECONF:append:mipsarcho32 = " --with-large_color_index=0"
 EXTRA_OECONF:append:armv7a = "${@bb.utils.contains('TUNE_FEATURES','neon','',' --disable-neon',d)}"
 EXTRA_OECONF:append:armv7ve = "${@bb.utils.contains('TUNE_FEATURES','neon','',' --disable-neon',d)}"
 
-TARGET_CFLAGS += "-std=gnu17 -fPIC"
+TARGET_CFLAGS += "-std=gnu17 -Wno-error=declaration-after-statement -fPIC"
 
 # Uses autoconf but not automake, can't do out-of-tree
 inherit autotools-brokensep pkgconfig