build/pkgs/r/spkg-configure.m4: Reindent, suppress some whitespace

build/pkgs/r/spkg-configure.m4

@@ -1,15 +1,14 @@
-SAGE_SPKG_CONFIGURE([r], [
-    dnl https://rpy2.github.io/doc/v3.4.x/html/overview.html#requirements
-    m4_pushdef([SAGE_R_MINVER],["3.5"])
-    PKG_CHECK_MODULES([R], [libR >= SAGE_R_MINVER], [
-            AC_PATH_PROG([R], [R])
-              AS_IF([test "x$R" = x], [
-                AC_MSG_NOTICE([R is not found])
-                sage_spkg_install_r=yes
-                ], [
-                dnl TODO: check that versions of R and libR match
-                sage_spkg_install_r=no
-                ])
-    ], [sage_spkg_install_r=yes])
-    m4_popdef([SAGE_R_MINVER])
+SAGE_SPKG_CONFIGURE([r], [dnl
+  dnl https://rpy2.github.io/doc/v3.4.x/html/overview.html#requirements
+  m4_pushdef([SAGE_R_MINVER], ["3.5"])
+  PKG_CHECK_MODULES([R], [libR >= SAGE_R_MINVER], [dnl
+    AC_PATH_PROG([R], [R])
+    AS_IF([test "x$R" = x], [dnl
+      AC_MSG_NOTICE([R is not found])
+      sage_spkg_install_r=yes
+    ], [dnl TODO: check that versions of R and libR match
+      sage_spkg_install_r=no
+    ])
+  ], [sage_spkg_install_r=yes])
+  m4_popdef([SAGE_R_MINVER])
 ])