build: I misunderstood these makefile conditionals.

GNUmakefile

@@ -33,9 +33,9 @@ UNAME_M := $(shell uname -m)
 ANDROID_SDK ?= ~/Android/Sdk
 BUNDLETOOL = out/bundletool.jar
 
-HAVE_WIN := 0
-HAVE_CROSS_AARCH64 := 0
-USE_SYSTEM_SSL := 0
+HAVE_WIN :=
+HAVE_CROSS_AARCH64 :=
+USE_SYSTEM_SSL :=
 
 export SOURCE_DATE_EPOCH=1
 export TZ=UTC
@@ -44,11 +44,11 @@ ifeq ($(UNAME_S),Darwin)
 BUILD_TYPES := macosdebug macosrelease iosdebug iosrelease iossimdebug iossimrelease
 else ifeq ($(UNAME_S),Linux)
 BUILD_TYPES := debug release
-HAVE_ANDROID = $(if $(shell which $(ANDROID_SDK)/platform-tools/adb),1,0)
-HAVE_LINUX_IOS = $(if $(shell which deps/ios_toolchain/target/bin deps/ios_toolchain/target/bin/arm-apple-darwin11-clang),1,0)
-HAVE_WIN = $(if $(shell which x86_64-w64-mingw32-gcc-win32),1,0)
+HAVE_ANDROID = $(if $(shell which $(ANDROID_SDK)/platform-tools/adb),1)
+HAVE_LINUX_IOS = $(if $(shell which deps/ios_toolchain/target/bin deps/ios_toolchain/target/bin/arm-apple-darwin11-clang),1)
+HAVE_WIN = $(if $(shell which x86_64-w64-mingw32-gcc-win32),1)
 ifneq ($(UNAME_M),aarch64)
-HAVE_CROSS_AARCH64 = $(if $(shell which aarch64-linux-gnu-gcc),1,0)
+HAVE_CROSS_AARCH64 = $(if $(shell which aarch64-linux-gnu-gcc),1)
 endif
 else ifeq ($(UNAME_S),Haiku)
 BUILD_TYPES := debug release
@@ -64,8 +64,8 @@ CFLAGS += \
 LDFLAGS += \
 	-lexecinfo \
 	-lc++abi
-HAVE_ANDROID := 0
-HAVE_LINUX_IOS := 0
+HAVE_ANDROID :=
+HAVE_LINUX_IOS :=
 else
 $(error Unexpected host platform $(UNAME_S).)
 endif