Merge bitcoin-core/secp256k1#1185: Drop SECP_CONFIG_DEFINES from examples

2f9ca28 Drop `SECP_CONFIG_DEFINES` from examples (Hennadii Stepanov)

Pull request description:

  User applications shouldn't need or rely on `SECP_CONFIG_DEFINES`.

  See bitcoin-core/secp256k1#1178 (comment).

ACKs for top commit:
  sipa:
    utACK 2f9ca28
  real-or-random:
    utACK 2f9ca28

Tree-SHA512: c8e81e6842b31e7f4ebcbb18d5962f7d7308f024025d6225330a7ec099739278bb43ad98243698c5802bcc49bf7e247ab7cae7f40008fbba87f0d0e46cbe1e85

Author: real-or-random

Makefile.am

@@ -149,7 +149,7 @@ endif
 if USE_EXAMPLES
 noinst_PROGRAMS += ecdsa_example
 ecdsa_example_SOURCES = examples/ecdsa.c
-ecdsa_example_CPPFLAGS = -I$(top_srcdir)/include $(SECP_CONFIG_DEFINES)
+ecdsa_example_CPPFLAGS = -I$(top_srcdir)/include
 ecdsa_example_LDADD = libsecp256k1.la
 ecdsa_example_LDFLAGS = -static
 if BUILD_WINDOWS
@@ -159,7 +159,7 @@ TESTS += ecdsa_example
 if ENABLE_MODULE_ECDH
 noinst_PROGRAMS += ecdh_example
 ecdh_example_SOURCES = examples/ecdh.c
-ecdh_example_CPPFLAGS = -I$(top_srcdir)/include $(SECP_CONFIG_DEFINES)
+ecdh_example_CPPFLAGS = -I$(top_srcdir)/include
 ecdh_example_LDADD = libsecp256k1.la
 ecdh_example_LDFLAGS = -static
 if BUILD_WINDOWS
@@ -170,7 +170,7 @@ endif
 if ENABLE_MODULE_SCHNORRSIG
 noinst_PROGRAMS += schnorr_example
 schnorr_example_SOURCES = examples/schnorr.c
-schnorr_example_CPPFLAGS = -I$(top_srcdir)/include $(SECP_CONFIG_DEFINES)
+schnorr_example_CPPFLAGS = -I$(top_srcdir)/include
 schnorr_example_LDADD = libsecp256k1.la
 schnorr_example_LDFLAGS = -static
 if BUILD_WINDOWS