configure: Avoid addition assignment operators

For compatability with other /bin/sh like busybox ash, since they don't
support the addition assignment operators (+=) and otherwise fails with:

	./configure: line 14174: regular_CFLAGS+= -D__UAPI_DEF_ETHHDR=0: not found

Signed-off-by: Achill Gilgenast <fossdd@pwned.life>
Signed-off-by: Florian Westphal <fw@strlen.de>

diff --git a/configure.ac b/configure.ac
index 2d38a4d4a7850c7850b020c27c7d162c38885c14..0106b3165a25c2a1eb410c54811d917cb10385cc 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -202,8 +202,8 @@ fi;
 pkgdatadir='${datadir}/xtables';
 
 if test "x$enable_profiling" = "xyes"; then
-       regular_CFLAGS+=" -fprofile-arcs -ftest-coverage"
-       regular_LDFLAGS+=" -lgcov --coverage"
+       regular_CFLAGS="$regular_CFLAGS -fprofile-arcs -ftest-coverage"
+       regular_LDFLAGS="$regular_LDFLAGS -lgcov --coverage"
 fi
 
 AC_MSG_CHECKING([whether the build is using musl-libc])
@@ -222,7 +222,7 @@ AC_COMPILE_IFELSE(
 AC_MSG_RESULT([${enable_musl_build}])
 
 if test "x$enable_musl_build" = "xyes"; then
-       regular_CFLAGS+=" -D__UAPI_DEF_ETHHDR=0"
+       regular_CFLAGS="$regular_CFLAGS -D__UAPI_DEF_ETHHDR=0"
 fi
 
 define([EXPAND_VARIABLE],