Makefile: Add support for custom build options in config.mak file

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

.gitignore

 /apidocs
 /trash-*.exe
 /libgit2.pc
+/config.mak
 *.o
 *.a
 *.exe

Makefile

@@ -55,6 +55,8 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 	SPARSE_FLAGS=-Wno-one-bit-signed-bitfield
 endif
 
+-include config.mak
+
 SRC_C = $(wildcard src/*.c)
 OS_SRC = $(wildcard src/$(OS)/*.c)
 SRC_C += $(OS_SRC)

tests/Makefile

@@ -41,6 +41,8 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 	EXTRA_LIBS += -lwsock32 -lpthread
 endif
 
+-include ../config.mak
+
 GIT_LIB = ../libgit2.a
 
 HDRS = $(wildcard ../src/*.h)