Compatibility with SDL2_Pango 0.1.3

Include all headers needed by SDL2_Pango when building the fonts file by
querying pkg-config.

Makefile

@@ -294,6 +294,7 @@ NOSOUNDFLAG:=$(if $(SDL_MIXER_LIB),,-DNOSOUND$(warning -lSDL2_Mixer failed, no s
 
 # SDL Pango is needed to render complex scripts like Thai and Arabic
 SDL2_PANGO_LIB:=$(call linktest,SDL2_Pango,-lSDL2_Pango,$(SDL_LIBS))
+SDL2_PANGO_CFLAGS:=$(shell $(PKG_CONFIG) --cflags SDL2_Pango)
 NOPANGOFLAG:=$(if $(SDL2_PANGO_LIB),,-DNO_SDLPANGO$(warning -lSDL2_Pango failed, no scripts for you!))
 
 SDL_LIBS+=$(SDL_MIXER_LIB) $(SDL2_PANGO_LIB)
@@ -341,6 +342,7 @@ CFLAGS:=$(CPPFLAGS) $(OPTFLAGS) -W -Wall -fno-common -ffloat-store \
 	-Waggregate-return \
 	-Wstrict-prototypes -Wmissing-prototypes \
 	$(shell src/test-option.sh -Wstrict-aliasing=2) \
+    $(SDL2_PANGO_CFLAGS) \
 	$(ARCH_CFLAGS)
 
 DEFS:=-DVER_DATE=\"$(VER_DATE)\" -DVER_VERSION=\"$(VER_VERSION)\" \

docs/CHANGES.txt

@@ -71,6 +71,9 @@ http://www.tuxpaint.org/
       Terrence Sheflin <terrence.sheflin@gmail.com>
       Pere Pujal i Carabantes <perepujal@gmail.com>
 
+    * Compatibility with SDL2_Pango 0.1.3.
+      Mark Kim <markuskimius@gmail.com>
+
   * Documentation updates:
     ---------------------
     * Update macOS build instructions for SDL2.0.