Normalize bcmath extension sources (#14655)

Follow-up of GH-14654

Author: petk

ext/bcmath/config.m4

@@ -4,12 +4,33 @@ PHP_ARG_ENABLE([bcmath],
     [Enable bc style precision math functions])])
 
 if test "$PHP_BCMATH" != "no"; then
-  PHP_NEW_EXTENSION(bcmath, bcmath.c \
-libbcmath/src/add.c libbcmath/src/div.c libbcmath/src/init.c libbcmath/src/neg.c libbcmath/src/raisemod.c libbcmath/src/sub.c \
-libbcmath/src/compare.c libbcmath/src/divmod.c libbcmath/src/int2num.c libbcmath/src/num2long.c libbcmath/src/recmul.c \
-libbcmath/src/sqrt.c libbcmath/src/zero.c libbcmath/src/doaddsub.c libbcmath/src/floor_or_ceil.c libbcmath/src/nearzero.c libbcmath/src/num2str.c \
-libbcmath/src/raise.c libbcmath/src/rmzero.c libbcmath/src/round.c libbcmath/src/str2num.c libbcmath/src/convert.c,
-          $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
+  PHP_NEW_EXTENSION([bcmath], [m4_normalize([
+    bcmath.c
+    libbcmath/src/add.c
+    libbcmath/src/compare.c
+    libbcmath/src/convert.c
+    libbcmath/src/div.c
+    libbcmath/src/divmod.c
+    libbcmath/src/doaddsub.c
+    libbcmath/src/floor_or_ceil.c
+    libbcmath/src/init.c
+    libbcmath/src/int2num.c
+    libbcmath/src/nearzero.c
+    libbcmath/src/neg.c
+    libbcmath/src/num2long.c
+    libbcmath/src/num2str.c
+    libbcmath/src/raise.c
+    libbcmath/src/raisemod.c
+    libbcmath/src/recmul.c
+    libbcmath/src/rmzero.c
+    libbcmath/src/round.c
+    libbcmath/src/sqrt.c
+    libbcmath/src/str2num.c
+    libbcmath/src/sub.c
+    libbcmath/src/zero.c
+  ])],
+  [$ext_shared],,
+  [-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1])
   PHP_ADD_BUILD_DIR($ext_builddir/libbcmath/src)
   AC_DEFINE(HAVE_BCMATH, 1, [Whether you have bcmath])
 fi