Allow user to override required flags

Author: Andras Fekete

configure.ac

@@ -330,11 +330,11 @@ AC_ARG_ENABLE([wolfprovider],
     )
 if test "x$ENABLED_WOLFPROVIDER" != "xno"
 then
-    enable_all_crypto=yes
-    enable_opensslcoexist=yes
-    enable_sha=yes
-    enable_eccminsz=192
-    with_max_ecc_bits=1024
+    test -z "$enable_all_crypto" && enable_all_crypto=yes
+    test -z "$enable_opensslcoexist" && enable_opensslcoexist=yes
+    test -z "$enable_sha" && enable_sha=yes
+    test -z "$enable_eccminsz" && enable_eccminsz=192
+    test -z "$with_max_ecc_bits" && with_max_ecc_bits=1024
     AM_CFLAGS="$AM_CFLAGS -DWC_RSA_NO_PADDING -DWOLFSSL_PUBLIC_MP -DHAVE_PUBLIC_FFDHE -DHAVE_FFDHE_6144 -DHAVE_FFDHE_8192 -DWOLFSSL_PSS_LONG_SALT -DWOLFSSL_PSS_SALT_LEN_DISCOVER"
 fi